Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b044e21319724f7…

MALICIOUS

PDF

85.7 KB Created: 2021-05-25 12:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fd40a6e7166ef58bf6c674f17a86947c SHA-1: d7748fce80fae43ba0121097492148266eea5133 SHA-256: 6b044e21319724f752393919ce22ff5bc30cf10fe60aeae43fa09672758707bd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary redirector URL, https://vilenefex.ru/strik?utm_term=no+sonrias+que+me+enamoro+blue+jeans+pdf, is flagged as a high-risk indicator. ML classifiers and ClamAV also identified this PDF as malicious, likely due to its phishing and trojan characteristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=no+sonrias+que+me+enamoro+blue+jeans+pdf PDF link annotation
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/fobagurumixasosubuv.pdfIn PDF document text
    • https://gekaketiba.weebly.com/uploads/1/3/1/4/131455198/3829659.pdfIn PDF document text
    • https://nawenakugod.weebly.com/uploads/1/3/6/0/136048640/2150466.pdfIn PDF document text
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/kuzajude.pdfIn PDF document text
    • https://gebijodefilamoz.weebly.com/uploads/1/3/1/4/131406109/tefuvaneki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/850f94b6-a811-4781-aadc-e73cff7deae0/estudio_del_trabajo_roberto_garcia_criollo_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7972ec70-a592-4d83-8c84-d0d64b8e5010/motorola_symbol_mc9090_factory_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2063dd-4552-41d5-9d85-31bccc07a857/wozarulevafebimusulege.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/kepamimanuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdee7c9b-e808-4aa9-b526-54827ef7e0ee/dunuromoriral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7859fd44-fb34-4e22-9985-71359baaa1d0/gubufeto.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/74402228541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9562b9bd-32bc-486d-b267-800996265172/lavowowawibubal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/874a9346-b493-4b54-bd00-d6d934f8d427/how_to_become_a_speaker_for_ted_talks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b937857-1145-443e-9a19-343c202b3550/spectrum_cable_box_ref_code_s0900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7886e751-ecb1-4a26-addf-8c2cd9318802/98240100533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b44965b-0cc2-4fc3-a1bf-5447aa641847/diccionario_espaol_latin_vox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ded92b-61b6-4fee-b5ca-ee17da583bd4/13711699246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d3c8b6-d6ce-4478-b01c-df514b67efda/los_titulos_de_credito_derecho_mercantil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a57b933-ee56-4814-9f79-a2dc92dcbf64/80953082997.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/particular_solution_of_differential_equation_calculator_with_steps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d4d650-9255-4f36-ba8d-2c2e6eb9c79f/2105156998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738ede01-580e-4458-912a-63c4e1343998/how_to_make_a_simple_wooden_cutting_board.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/sentry_safe_lost_master_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e18fc200-bc97-4b71-8ae2-859815c8ba9d/what_is_the_main_point_of_the_cask_of_amontillado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f15d42d-3469-4371-a35a-ff6e3cca3f5d/42067245277.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 5496 bytes
SHA-256: 52c709bcfd1c76bd1b2ef09a7a6508083debcea5692d39190a2b5e47c6b69507
font_01_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 12440 bytes
SHA-256: 5adf0584e56013e42be29fe8dbf8d3d27dcca686dbab7a007cb9d61dd045f372
font_02_sfnt_off000131ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131ED 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61