Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff3ff73984cb01b…

MALICIOUS

PDF

74.7 KB Created: 2021-03-31 22:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7ac7cf6801e92a920850111f323ce1a3 SHA-1: 747963d9335c347470baa67513298c2fb26ecf2a SHA-256: 9ff3ff73984cb01bcde43bfec876934f1a23ffe88061365673ee7c16cb654e44
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://xajibur.ru/award?keyword=anarcho+syndicalism+theory+and+practice+pdf PDF link annotation
    • https://cdn.sqhk.co/jifegusewe/8HfGy10/97149475471.pdfIn PDF document text
    • http://fozixozag.iblogger.org/marantz_sr5009_factory_reset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_604f5f03d7712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469634/normal_60269e17902d9.pdfIn PDF document text
    • https://cdn.sqhk.co/foxuninulini/jhm8iaC/vizexomalosikitira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479691/normal_602d8063751a7.pdfIn PDF document text
    • https://cdn.sqhk.co/wikepijosipi/heRiehd/85795030601.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_1dda536e8991471dbf510fe241e3cbc8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/watch_bbc1_live_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/phoolon_sa_chehra_tera_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/64503317998.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_532bd4d72c7f449fa9e82d3375d9805c.pdf?index=trueIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_f7ed1b8b24634ce8b77e86d67c016f74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/69426451271.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/how_to_calculate_transformer_kva_to_amps.pdfIn PDF document text
    • http://palisoji.rf.gd/basketball_positions_explained.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/40783689111.pdfIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_d1f58ba8ec794cbe84e2d3f399971140.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/43250667876.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_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 5484 bytes
SHA-256: b2086b9330d9520138abe465e6b7b3d9c2860b689c0f5f6be3bc8acda4976c6b
font_01_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 11880 bytes
SHA-256: e0772fe8183abfdf173545d9435097c6d3eb0e0e21b600b6d54789a3f443d87a

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