Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8aef7f0f53b79c…

MALICIOUS

PDF

82.2 KB Created: 2021-02-28 15:37:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf480cab07a14423da4016ef96f38dec SHA-1: e5d66094c8d43e48d200df52a4ef8ddbbcf616c3 SHA-256: 5e8aef7f0f53b79cfb68a2ac1450676876081f26ec4e291c5f3d3cdd4ccb0130
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-themed, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=women%2527s+suffrage+worksheet+pdf
    • https://cdn-cms.f-static.net/uploads/4383574/normal_600f056bb09c3.pdf
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/a9d20dec007e.pdf
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/nodoza.pdf
    • http://xadojewivo.iblogger.org/girozukowub.pdf
    • http://pidejofejan.iblogger.org/4694902844.pdf
    • https://radogatibemif.weebly.com/uploads/1/3/2/8/132815767/ba3f34f.pdf
    • https://static.s123-cdn-static.com/uploads/4420030/normal_5ff59c8093add.pdf
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/dawidanilupi_jiwojiwitewa_womunewu_dakebadege.pdf
    • https://bazopozetera.weebly.com/uploads/1/3/1/6/131637116/6761849.pdf
    • https://gegizadewer.weebly.com/uploads/1/3/1/4/131482997/ralute_mupatum_fekelavokotag.pdf
    • https://joweralifaj.weebly.com/uploads/1/3/4/3/134350132/9047312.pdf
    • https://static.s123-cdn-static.com/uploads/4446158/normal_5fc96edb374ae.pdf
    • https://cdn-cms.f-static.net/uploads/4447915/normal_601baaa7cc98b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://legofovivaxom.epizy.com/36735954151.pdf
    • https://s3.amazonaws.com/suxugipipolazog/lonilarivivarubaboje.pdf
    • https://s3.amazonaws.com/mamibis/newizaxopifibe.pdf
    • https://s3.amazonaws.com/kalanejaxutilif/55025068081.pdf
    • http://wowimiberosodav.epizy.com/48896807936.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104f8.bin
3cd919df28e7d4b990acc00d2d4ee395bdbb5629677b58b42610d6752458e97b
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F8 5628 bytes
font_01_sfnt_off0001181c.bin
9646c6759e8e33b4fd83e53ac4d7356db524a4d79c0f339843d12bd0bdae5533
pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 10376 bytes