Malicious PDF — malware analysis report

Static analysis result for SHA-256 24beab8dcfd73c8b…

MALICIOUS

PDF

72.3 KB Created: 2021-01-11 19:13:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 72d371cb8912c92830c2f386add203f8 SHA-1: 7679a700302b68a2b7e8b114daf2d7c85e71a6da SHA-256: 24beab8dcfd73c8b911ed7ba5240511e1b6ac562366bd3c2058801368d7a8e53
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one identified as a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a 'typing course'. The presence of numerous disposable hosting links further indicates a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and URL analysis strongly suggest malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=peters+typing+course In PDF document text
    • https://vabebixeteguju.weebly.com/uploads/1/3/4/2/134234611/655eec651bc534.pdfIn PDF document text
    • https://site-1174463.mozfiles.com/files/1174463/craftsman_lawn_mower_oil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5fcef4433666a.pdfIn PDF document text
    • https://site-1167986.mozfiles.com/files/1167986/stickman_shadow_fighter_apk.pdfIn PDF document text
    • https://wizemeleg.weebly.com/uploads/1/3/4/3/134307012/9786632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_5fa34a54b0f37.pdfIn PDF document text
    • https://site-1176671.mozfiles.com/files/1176671/mk11_skins_dlc.pdfIn PDF document text
    • https://loxutagunepolu.weebly.com/uploads/1/3/4/7/134763456/zodumisud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_5fa0338229e36.pdfIn PDF document text
    • https://site-1177029.mozfiles.com/files/1177029/41207837348.pdfIn PDF document text
    • https://site-1172346.mozfiles.com/files/1172346/nuts_bolts_washers_near_me.pdfIn PDF document text
    • https://site-1168059.mozfiles.com/files/1168059/gepekoj.pdfIn PDF document text
    • https://site-1179563.mozfiles.com/files/1179563/nuruzosibusupovirakegu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jovekus/baseerat_ul_quran.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_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 4964 bytes
SHA-256: 59d7570760197689c9efdfadec5e06571e47d4ed38ea7bf9d1bb55e28926671c
font_01_sfnt_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 11500 bytes
SHA-256: 4351d5a92eae442da9eb3d57958412a037a7f4d2074163a060cc2d7a2463cfcc

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