Malicious PDF — malware analysis report

Static analysis result for SHA-256 5167ce33129b64b0…

MALICIOUS

PDF

95.3 KB Created: 2021-05-11 21:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 99a6067cd49ab8b26b422ed495c9bb1f SHA-1: 117340cbad459f9c8f5c3545faa1ae848fcad95b SHA-256: 5167ce33129b64b00a3066fb1008e6a3e30573ff09dbb376f542570acd6c39f8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with the primary one being `https://jumiwimov.ru/strik?utm_term=lewis+dot+diagram+worksheet+key`. The document body, though heavily obfuscated, suggests a lure related to a 'Lewis dot diagram worksheet key'. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/strik?utm_term=lewis+dot+diagram+worksheet+key PDF link annotation
    • http://techanomic.com/troy_bilt_storm_2840_air_filter2u6u9.pdfIn PDF document text
    • http://gidigunorefe.iblogger.org/xizatufanozubegenedose.pdfIn PDF document text
    • https://jewevugaxezi.weebly.com/uploads/1/3/5/9/135967143/femoserofeseme.pdfIn PDF document text
    • http://linza.media/sutra_du_lotusfotm9.pdfIn PDF document text
    • https://bexudedumazises.weebly.com/uploads/1/3/1/4/131406785/7086314.pdfIn PDF document text
    • http://educationonline.website/how_to_make_a_monster_truck_valentines_day_box9yu4c.pdfIn PDF document text
    • https://ginixagizelak.weebly.com/uploads/1/3/5/3/135349131/5691af19b4f910b.pdfIn PDF document text
    • https://saditifoba.weebly.com/uploads/1/3/5/3/135325123/746e814.pdfIn PDF document text
    • http://boxberry-24.cc/pomupimavkm3nq.pdfIn PDF document text
    • http://geleostone.online/how_to_be_an_engineer_in_singaporez2r57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mebexadesojixip.rf.gd/bright_starts_nemo_bouncer_assembly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f434038-265f-47c3-96c4-09cd965f554b/49307554104.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/que_significa_la_linea_de_alba.pdfIn PDF document text
    • http://nitovotiroxe.epizy.com/george_foreman_rotisserie_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6fb4add-23ec-4bd3-aff0-77982144e36d/autores_del_renacimiento_espaol_literatura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/409cbafd-93d2-436a-aa9a-31553a161b36/jesepidoxururumegumero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d6a53a-103d-4f4f-80ca-cc31d94c9570/hitachi_rice_cooker_rz-d10vfy_review.pdfIn PDF document text
    • http://zegisaxan.rf.gd/sotanufexasabajeko.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/what_is_the_value_of_dale_earnhardt_diecast_collectibles.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_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 5408 bytes
SHA-256: 8496d6a3743f4dc43f7d7156f2153e89bcf11cf1cd080d1ff97be52a0b50a92a
font_01_sfnt_off00011b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 22160 bytes
SHA-256: 694e91426bb31c01d92a57262b5033bcdd266a0158e4374634a01e1b2243a508
font_02_sfnt_off00015ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB3 16096 bytes
SHA-256: e097276a2c928a817f8da278a7ed3b91f8f9713ee6c2a9a1ef68c1d11d11f259

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