Malicious PDF — malware analysis report

Static analysis result for SHA-256 7129212af84b7bd4…

MALICIOUS

PDF

84.8 KB Created: 2021-04-10 19:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 37ab69ff4514c66d54bb5d2e7b191fa7 SHA-1: 68e2b1945a0f001e0886cf86691c906f6a3e9fdb SHA-256: 7129212af84b7bd4629188156801e1371318a1a10ec081af3dc3eebf07a3b6dd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a specific heuristic identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=how+to+write+3+body+paragraph+essay PDF link annotation
    • http://ninureluxoxanu.22web.org/the_kite_runner_study_guide_questions_chapters_1-5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5ff18769a5fa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_6016490f4d0d0.pdfIn PDF document text
    • https://cdn.sqhk.co/rinovizifim/mz7ggGH/dragon_quest_xi_official_strategy_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374843/normal_5fca378ea599b.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/sap_bods_tutorial_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/kimorotadopo/Rv5ihyD/tamilrockers_hd_2018_telugu_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/medasozuf/cihaieM/art_therapy_certification_online_course.pdfIn PDF document text
    • http://tanubujurutemut.scienceontheweb.net/liver_biopsy_procedure.pdfIn PDF document text
    • http://xifutipixa.mywebcommunity.org/nabiwivotawedog.pdfIn PDF document text
    • https://cdn.sqhk.co/didirepakavi/ijdVjdb/thomas_real_dad_basketball_wives.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418981/normal_5ffdc32db77c3.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://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_77df770ebfc04e47bc0d3c6ed6d53d95.pdf?index=trueIn PDF document text
    • http://telijekiw.epizy.com/nusodadiwak.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_b9df1bd4590744f6802d2d7205a439f6.pdf?index=trueIn PDF document text
    • http://ribaxekag.epizy.com/18056157062.pdfIn PDF document text
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_6fcc3df45eb74855841f0c9a69904bdd.pdf?index=trueIn PDF document text
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_beb0f5b8542f49cf94415b4c3f01bff3.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_c33c5a70221b48b882d1edd25ffb4627.pdf?index=trueIn 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_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 5332 bytes
SHA-256: d977e4db8d73ea5f50f12dcec3eb4f99b7b131797a7850c288df24a4a632d7aa
font_01_sfnt_off000111db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DB 10592 bytes
SHA-256: 36d5153b0e487a5edf5273a8e10020eda4b228cb8df1411575b3e1f7d425ddd2
font_02_sfnt_off000135cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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