Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd32efd666cba68…

MALICIOUS

PDF

89.9 KB Created: 2021-02-27 13:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 688ba46418bdc094e1a81173b64c248e SHA-1: 39c6f0b5c31a920f10d7611cbb907bf7fac1f89c SHA-256: 7dd32efd666cba685a2f6141ee3ff3c7fb08e224ad59ea2c44732d8b0ff946b6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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/strik?utm_term=python+sort+nested+list+alphabetically PDF link annotation
    • https://cdn.sqhk.co/siduniberame/ahbhiii/reponubidijul.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/b6idieP/blue_moon_lyrics_billie_holiday.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424985/normal_6032c2152471e.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/Via0gjG/can_photomath_plus_do_word_problems.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/jcuuaX8/pilomatrixoma_neck_icd_10.pdfIn PDF document text
    • https://cdn.sqhk.co/pajijolabalu/aJWihjg/galaxy_wolf_wallpaper_4k.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/how_to_keep_track_of_weight_loss.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/hcheihf/life_the_game_simulator_2016.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/6528903.pdfIn PDF document text
    • https://cdn.sqhk.co/fazejitev/EjgejaD/keliretosukeje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385030/normal_6003d2c787733.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/jcWgYjj/neet_challenge_questions_2020.pdfIn PDF document text
    • https://lejonelawubuw.weebly.com/uploads/1/3/1/4/131453657/ruwaresi_jisikutujateru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001229c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229C 5404 bytes
SHA-256: d0b91d2684c4686d40313e0aed88eb4d24814123a7eeea9b2af1a53c9e37ada9
font_01_sfnt_off000134f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F3 10940 bytes
SHA-256: 26cd122bbbbb29a42460c03b5fce554fd92446bfd043320f88f8057c586fd862

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