Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd7a5e97c39ac0f…

MALICIOUS

PDF

86.5 KB Created: 2021-03-14 00:39:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00e24f03ed7d3a36e82a2adbf41e511b SHA-1: a1addafb77ac33ab048b66b13a7bc89b02091b64 SHA-256: bbd7a5e97c39ac0f6b47e32d7434030a785a4339acfcf2374720f263a761f9b0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'Google python docstring format' and 'wkhtmltopdf', likely a pretext to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/123?utm_term=google+python+docstring+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5fd83164c73c9.pdfIn PDF document text
    • http://wekeb.space/mexodawuvexamowixabudwlj6r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403406/normal_5fc8dc851d347.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450721/normal_5ff4446b7ecf4.pdfIn PDF document text
    • http://saudiautoinsurance.com/koponavksh5h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_603a78e9e7885.pdfIn PDF document text
    • https://wavuzujez.weebly.com/uploads/1/3/1/4/131406867/1837492.pdfIn PDF document text
    • https://buriviniroxino.weebly.com/uploads/1/3/1/6/131606563/2649194.pdfIn PDF document text
    • http://italylife.pro/algebra_worksheet-_section_10._5_factoring_polynomials3qhl9.pdfIn PDF document text
    • https://bufetokarad.weebly.com/uploads/1/3/4/0/134096279/1300344.pdfIn PDF document text
    • https://defilapaxupote.weebly.com/uploads/1/3/5/3/135335242/2776968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444356/normal_60476f66937c8.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/hhajjpN/games_like_war_2_victory.pdfIn PDF document text
    • http://svarka-aurora.online/9392124127603yds.pdfIn PDF document text
    • https://cdn.sqhk.co/likunubiba/cEh8qic/new_cartoon_movies_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/vonitumefide/jgjagfp/draw_a_stickman_epic_2_walkthrough_level_8.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/injajPB/cheap_mudding_four_wheelers_for_sale.pdfIn PDF document text
    • http://noksipals.online/9679428554bbmp7.pdfIn PDF document text
    • http://apkweb.net/fezexefewidqwbkp.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://s3.amazonaws.com/jafujasiwetid/conjunctions_and_but_so_because_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/zudoxobanotuwovuwugas.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/orbit_sprinkler_timer_not_starting.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/21846290173.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/fb_messenger_for_pc_free.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_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 5492 bytes
SHA-256: d7cb6facb2bfbbe15656e8e25cb1ad56ac4a9515e9e821988bf00a8813bb6855
font_01_sfnt_off0001171c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 11420 bytes
SHA-256: 7a4a301af9be807ed64b54911f61b4216c4848352c0d58b6ff8c8edbb2bb5f2f
font_02_sfnt_off00013e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E51 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c