Malicious PDF — malware analysis report

Static analysis result for SHA-256 82afdd528dc8597e…

MALICIOUS

PDF

74.6 KB Created: 2021-02-24 03:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: edb172fc558ab447027a9c88ee565e90 SHA-1: 33350a03a7feaabc2542d222688f3c63885b9e73 SHA-256: 82afdd528dc8597e6c9a3ed7fc0c73014e81818c1c12b71c7f579d8f52aa845d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, indicating a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://maypoin.ru/strik?utm_term=is+there+a+kid+version+of+cards+against+humanity PDF link annotation
    • https://cdn.sqhk.co/niserutom/gn5OMx1/kanto_yu_vs_audioengine.pdfIn PDF document text
    • http://sberbank.services/rifesawopi8wgk5.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/QhglBMn/impossible_bottle_flip_download.pdfIn PDF document text
    • https://cdn.sqhk.co/muwanije/uHhbISp/border_patrol_agent_jobs_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/aWhfjbi/learn_carpentry.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/chdijyl/viruses_are_not_classified_as_living_organisms_because.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/Pjf3fXP/facebook_messenger_mobile_web_browser.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/iaigPBj/sculpting_air_dry_clay_tutorial.pdfIn PDF document text
    • http://christinaanddavid2019.com/dragon_age_worked_to_the_bonenrsfu.pdfIn PDF document text
    • http://idealicaitalia-official.site/61449694651oq0o8.pdfIn PDF document text
    • https://cdn.sqhk.co/gagowuname/gfLidjg/kiko_chavo_del_8_quotes.pdfIn PDF document text
    • http://m-ryanaf.site/5301606627668ktz.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/fivado.pdfIn PDF document text
    • https://titawijuneve.weebly.com/uploads/1/3/4/0/134012454/2972448.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/8jj8hbV/loopback_audio_mac_crack.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
    • 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_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 5448 bytes
SHA-256: 44a245da73ff81a6e51273129ad4f28a3a74a309cd9a2050eb616db18259bd2c
font_01_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 11016 bytes
SHA-256: b50eea820b510b0037ea798fe376d9e9499ca59679a9ee11dbd1669dea9efa0a
font_02_sfnt_off00010efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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