Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bc22b276690013…

MALICIOUS

PDF

85.7 KB Created: 2021-03-08 12:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 020f93b3c6146a0f6c66f603439e0290 SHA-1: d9d7389d71594b5f50be09acd0826c88ac1664b3 SHA-256: 39bc22b2766900138b94e446daeead99e6405213b7311415084ff697d8be1570
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to S3 buckets and Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The primary external URI points to 'zajinet.ru', which is likely part of a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful 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 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/wix?keyword=lorex+lw2962h+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370088/normal_602f22a2caa65.pdfIn PDF document text
    • https://nopumalazaf.weebly.com/uploads/1/3/0/8/130813483/nosofeb.pdfIn PDF document text
    • https://zefivevolexu.weebly.com/uploads/1/3/1/6/131637056/likuxevoxun.pdfIn PDF document text
    • https://mejavepo.weebly.com/uploads/1/3/1/4/131438157/e4c911.pdfIn PDF document text
    • https://lowunidedalovel.weebly.com/uploads/1/3/1/3/131380213/toguwafineki.pdfIn PDF document text
    • https://kadamoxezegawuf.weebly.com/uploads/1/3/4/3/134347408/ca6930c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470980/normal_6004f7e1af553.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/8459820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489839/normal_5fd665d225951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_6017868fb0c3d.pdfIn PDF document text
    • https://nivozigagu.weebly.com/uploads/1/3/4/4/134439663/6306324.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474759/normal_5fd0404b7e2e7.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/limewub/winirisujobeki.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/73247477187.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/vikobigep.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/29407950141.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/tamilrockers_avengers_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/95264799488.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_off00011120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11120 5644 bytes
SHA-256: 81c574f7a723604ea9e4ded07a5ec0271f1a51af29e35d2bd7008a76d1576c53
font_01_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 11036 bytes
SHA-256: f4fad3bdc93d087c11cbd651d3fe1ae708c0937454e46e49acf561dda681aad8

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