Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3a638f3a7ac393…

MALICIOUS

PDF

75.9 KB Created: 2021-05-24 17:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4e37ad04ea868264f99b68b660967f2c SHA-1: 0a4e1e83ccd0ca8ab48c7191d97f310a4f257cc5 SHA-256: 6f3a638f3a7ac39340851c706607130d0e36a61b4f717f44141bf7da66f932e2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One prominent malicious URL, 'https://pelibifir.ru/strik?utm_term=komik+t%25C3%25BCrk+film+indir', is present and likely serves as a distribution point for further malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing and trojan threat.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=komik+t%25C3%25BCrk+film+indir PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496389/normal_60257e9a52664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407810/normal_606cac449abd0.pdfIn PDF document text
    • https://lomizagufefeg.weebly.com/uploads/1/3/4/0/134096038/roxemedozokuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_60589ced6bdea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456398/normal_604ddb3c204be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488556/normal_602c62556e64f.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/giwulorot_zubegugunogux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/74711d69-9a85-49fe-a577-e68a8618e4b0/holt_mcdougal_modern_world_history_patterns_of_interaction.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/galilabinuserejelimafu.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/kinoxofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a2c0318-080b-461c-9873-d747ef9fa5b4/with_winning_in_mind_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/what_are_different_removable_partial_denture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7030dab-b3b1-462b-b81f-8131a58d3936/in_work_adjustment_theory_the_value_of_status_includes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/108925c7-3f5a-4cb6-b54b-97ac77836864/fifikajiwifixugejuzamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e4c454-1147-4d64-90ed-8c788f07bf7f/ronimamanisuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ebf6dbc-1e16-4c18-a24d-8662a0ef0b45/how_to_write_a_counterclaim_in_an_argumentative_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/finite_and_nonfinite_verbs_worksheets_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/99363633880.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/pawuwuzabavulew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92da7c40-23d1-42d2-a807-c6fdbe8335b6/wuporumukuvotom.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/41340062466.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/asphalt_nitro_game_for_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/383512281.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 4488 bytes
SHA-256: 3df782017ef7de77fdb853e9a0dfb71efc1af8a10f74e14b29cf0cd4a966d88a
font_01_sfnt_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 11900 bytes
SHA-256: 0b29728bc4515516999ace5626cce06f1e67d96bb60ab92201ae030a803cc1f4
font_02_sfnt_off00011261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11261 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378