Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f9718fd82f25c2…

MALICIOUS

PDF

73.2 KB Created: 2021-03-20 19:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2128e79f39bd0d2c5751b4154b6aaa52 SHA-1: 902455c7cfb1399b5e079fecbd7c2831e6f1c4fe SHA-256: d3f9718fd82f25c2f9494a2869d5fd49f6c4cb4473bf5324b46ee92132870c23
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://nipisod.ru/strik?utm_term=bose+acoustimass+15+series+ii+input+cable PDF link annotation
    • http://hotgirls.host/kexujasabajuronajadu9ay1y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492259/normal_6001d0fe8d4ba.pdfIn PDF document text
    • http://wisidakofaxom.iblogger.org/legal_assistant_job_description.pdfIn PDF document text
    • http://electriccannoz.club/cowboy_corgi_breed_information98m8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_6013ab3c0be05.pdfIn PDF document text
    • http://clyb-wylcan3.space/saladin_crusades_battle5jfco.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_702e7239aca04a4696b5d226b74bfbbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/pegatron_motherboard_2ac2.pdfIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_2b47f56020be41049579052e0051116d.pdf?index=trueIn PDF document text
    • http://dekutob.epizy.com/wheel_of_time_book_12.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/55009989678.pdfIn PDF document text
    • https://ad060920-74d0-4a59-a46a-f478898ed72a.filesusr.com/ugd/a7c1e6_e2a5f0d4345c404a8090f22a44d1f3d7.pdf?index=trueIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_2d0f709acc4a440a9cb6c5d8dbb7b16b.pdf?index=trueIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_e228add7996747a6b97de75afbd4712c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/9028543961.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/aerial_photography_drone.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/best_grill_cover_for_weber_spirit_310.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_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 5444 bytes
SHA-256: 38408a70291f60639eadaf0a103a032b4dd142626614225c71da51a99af3f488
font_01_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 11560 bytes
SHA-256: 271bed608691561887e0492407b20429736c5b07b1fbb2904ed4ca7059f17530

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