Malicious PDF — malware analysis report

Static analysis result for SHA-256 3059ad07e3400d66…

MALICIOUS

PDF

89.4 KB Created: 2021-03-14 21:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1b23ef784dd283b3a2742fc7a7bbc415 SHA-1: 58d8e6d3c8c2e3f00ac37e6c52311956b5bd3f0e SHA-256: 3059ad07e3400d663eb1c0b2f23795c7b5dd941e9c938e6585689191292b3fbd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://pelibifir.ru/wix?keyword=skyrim+caco+guide', is presented as a game guide but likely leads to malicious content or further redirection. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • 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://pelibifir.ru/wix?keyword=skyrim+caco+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486522/normal_602b272e677c1.pdfIn PDF document text
    • https://cdn.sqhk.co/vimitewimuwi/iboLige/baba_koto_din_mp4_song.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/giggzxe/warzone_bunker_locations_and_codes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5ff60e31a3785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418171/normal_60315664d2be0.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/sPhfhg3/speedy_clean_inc_appleton_wi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454289/normal_6011debc9a618.pdfIn PDF document text
    • https://cdn.sqhk.co/kamupudoro/rjciihc/15703830198.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://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_20b2d6ebc437435695a22b0b7aabadb2.pdf?index=trueIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_27af1f0ba0404ac583dc6d411168e49e.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_4f0d765f41bc4fc6ba662b00710ccda3.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_1f4c069b900c4609af28fe37910f51f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leributafa/debate_about_school_uniforms_should_be_abolished.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/marine_corps_performance_evaluation_system_pes.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_c33e12392a45469582ee343377388144.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_7ed12827dfca4b398c73b3bd108866f6.pdf?index=trueIn PDF document text
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_e942ae1b0e2d468da0ffb060114563ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/pevitizikelemijajixodozi.pdfIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_ed5b61932fce43b7bc71b142003e78b1.pdf?index=trueIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_53efbf1ef30440adbf812a946545cc25.pdf?index=trueIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_e3f728e789d846059cc9a5c8168ff435.pdf?index=trueIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_33ed46dce39d488980f312c27948f595.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xisefowu/99459074622.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/panasonic_kx-tg7875s_best_buy.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_off000113b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B6 5012 bytes
SHA-256: d3baad1b54c0524129bf573d72eed92bcf0987c89172aa8beaf33d552200f91e
font_01_sfnt_off000124bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BB 11024 bytes
SHA-256: 70ee1a4ed98b617be64974f4554b6fcf372608f9322fcca6a3133ebf7700b389
font_02_sfnt_off00014a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333