Malicious PDF — malware analysis report

Static analysis result for SHA-256 890088c7a4ad1cf8…

MALICIOUS

PDF

79.4 KB Created: 2021-06-06 02:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 31811578ad44413f30325cc0998748c4 SHA-1: 502e02a64ab0d86aa961210cb6f3d805ea124828 SHA-256: 890088c7a4ad1cf858b0cf11325cb76aeb746c83adb89caf7dd256e383cb1e3e
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://allytemp.ru/pbw?utm_term=ielts+general+reading+practice+test+1-15 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452154/normal_5fd7ef7d0eaf6.pdfIn PDF document text
    • https://danupinizagene.weebly.com/uploads/1/3/1/4/131483344/fed94335fbf73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5fc9bdccb1dfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420434/normal_603ad6788e3d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476420/normal_5fced4f6660b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381997/normal_5fe322b7bcea6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5fdd8a998555e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473926/normal_5fec75367e564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450641/normal_600d1514efdc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374857/normal_5fddb690ccc5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485589/normal_603fd366842ef.pdfIn PDF document text
    • https://fubaxuzepavuzoz.weebly.com/uploads/1/3/4/7/134755559/rekexelowubije-suvanimig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_6024182cabb41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_60654a0801dd9.pdfIn PDF document text
    • https://lomelamul.weebly.com/uploads/1/3/5/9/135994015/tokusikuzozero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sokulus.pbworks.com/w/file/fetch/144692517/botumitividazefijuvatexe.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144458346/zusigowegefiwaz.pdfIn PDF document text
    • http://dewubuk.pbworks.com/w/file/fetch/144422817/simurere.pdfIn PDF document text
    • http://kigemulu.pbworks.com/w/file/fetch/144538272/periodic_trends_worksheet_answer_key_pogil.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_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 5384 bytes
SHA-256: e6539f848c2d61f4d8963ebc247929720c5feea451572091f5ebfd3826c5c55c
font_01_sfnt_off00010adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADB 11124 bytes
SHA-256: dff863cdc05a4b71ebdffb873bc0e29116a6b2ed40b12be0b94eded4da009fb4

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