Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b777c18bf970939…

MALICIOUS

PDF

93.1 KB Created: 2021-04-04 12:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8a3e7adb0b8828d982176c9f7611d8ad SHA-1: 27cafe6709280d3317806bc0a75d9dd9dab9705b SHA-256: 0b777c18bf970939dee51a7c4950e2b5a0f1528ede34ed5be60f6501b0667c98
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or potentially malicious domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/award?keyword=breadboard+how+to+use+pdf PDF link annotation
    • https://funexoxep.weebly.com/uploads/1/3/2/3/132303151/lepadenukewige.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413590/normal_5fdec870c9b29.pdfIn PDF document text
    • http://turoliwejaxafux.22web.org/kulejafikuwavogev.pdfIn PDF document text
    • https://nopewiviguzine.weebly.com/uploads/1/3/1/1/131164125/6597265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_604703aee91f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457849/normal_5fcd7c39923e0.pdfIn PDF document text
    • http://gudelew.mywebcommunity.org/level_of_care_utilization_system_manual.pdfIn PDF document text
    • http://biwumani.mywebcommunity.org/best_traditional_african_music.pdfIn PDF document text
    • http://sufupisiwe.22web.org/diagnstico_de_anemia_falciforme.pdfIn PDF document text
    • https://gikudinok.weebly.com/uploads/1/3/4/7/134730402/wuwomi.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/newspaper_article_template_for_students.pdfIn PDF document text
    • http://wegoluxetas.scienceontheweb.net/sezixi.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/scratch_tutorial_platformer_game.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/elgato_game_capture_hd60_s_requirements.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sivojosifa.epizy.com/balance_sheet_of_a_commercial_bank.pdfIn PDF document text
    • http://suzurexitumafod.epizy.com/instagram_blue_tick_hack_apk.pdfIn PDF document text
    • http://mimugewezis.rf.gd/whirlpool_duet_sport_dryer_owners_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB6 5376 bytes
SHA-256: f131df37fc5a99db8e42000eec6b08a18110a04d20c8d038df6a0065c911996e
font_01_sfnt_off00014107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14107 11288 bytes
SHA-256: d315ef226f3ce8a766e60b6799e945630982a88c9aaae6ed9813647e4640820d

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