Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ceb967c66330a8…

MALICIOUS

PDF

85.1 KB Created: 2021-02-17 03:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dd08a45b38352bd5d1355bd6cbd2404f SHA-1: 5bd9496cd3d509bb1b720812da84e66234e1aa9f SHA-256: 88ceb967c66330a87d80b69d929bb97ed35dedae472dffcaae883257b370c3b8
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wix?keyword=static+electricity+worksheet+grade+8 PDF link annotation
    • http://homeolimp.com/fallout_1_guidep2yws.pdfIn PDF document text
    • https://sokexeziboril.weebly.com/uploads/1/3/4/9/134902232/3290127.pdfIn PDF document text
    • https://cdn.sqhk.co/sojejinof/6jdzSQf/the_walking_dead_road_to_survival_mod.pdfIn PDF document text
    • http://thecabinets.xyz/gulef7597p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407314/normal_6024c061e006b.pdfIn PDF document text
    • https://majabowuji.weebly.com/uploads/1/3/6/0/136092793/volapuwuzixokakuxusi.pdfIn PDF document text
    • http://poverkavoda.website/fundamentals_of_drawing19xxv.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/7bb83a.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/zinatipuvdx0b.pdfIn PDF document text
    • http://meetdouche.xyz/xakogopefumodiwanojefesovrjav.pdfIn PDF document text
    • http://jirafka.space/42144752609kmbfp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_6028a21ce753d.pdfIn PDF document text
    • https://lilikisewusufod.weebly.com/uploads/1/3/2/6/132682662/mewidoto.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/wujapu/zimuvimexojalimuru.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/48908263549.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/bedirikalaw.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/aerius_drug_information.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/visual_code_python_auto_format.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_off00011025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 5756 bytes
SHA-256: 579b6146107d93c37e57eb1b72071bbbcdebb37e298f3ffe63de14d800f5d444
font_01_sfnt_off000123c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C9 10304 bytes
SHA-256: ec213b9aab16aff7736179b24c448f3dc64c4061c1cafedaa1f19278c621804e

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