Malicious PDF — malware analysis report

Static analysis result for SHA-256 3538117700bdca06…

MALICIOUS

PDF

89.5 KB Created: 2021-04-29 16:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fe004a8b55300465c5544cff3b57c109 SHA-1: 72f87c23ef04eb7307a2c5587205cef77cdb4857 SHA-256: 3538117700bdca06bf8109ad34ccf87943ca02d05bf0458df8ccdd4d7df075df
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9992

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=lord+i+need+you+quotes+tumblr PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375909/normal_606068f31ead5.pdfIn PDF document text
    • https://vukezozonobobex.weebly.com/uploads/1/3/1/3/131383599/tejore-wunaxiponabuj-tagadafozazes.pdfIn PDF document text
    • https://gizizajavime.weebly.com/uploads/1/3/2/6/132695742/5036095.pdfIn PDF document text
    • https://zapokeboxopi.weebly.com/uploads/1/3/0/7/130776852/efb818e78d07bf6.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/90157625135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407781/normal_5ff971e9800f9.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/gukokoneruwuvika.pdfIn PDF document text
    • http://xeberul.mywebcommunity.org/pabepobexowefogisixerowe.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/dapafofodugo.pdfIn PDF document text
    • https://rusokakes.weebly.com/uploads/1/3/4/0/134016884/2291938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479470/normal_6034329874e9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_603ed43089900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413975/normal_6021e97465c63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426814/normal_6056da824819a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500186/normal_604e66e664cc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rewuwuja.onlinewebshop.net/mufikorewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c05b079-2cd6-4e96-9f6d-2157303d42a5/85231312549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9164aa9-8083-41cd-969a-2d3a82edd079/saga_dulces_mentiras_amargas_verdades_orden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ce1b53-b039-4296-9099-921d6bd2fcfb/sherlock_holmes_short_stories_list.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/13960007068.pdfIn PDF document text
    • http://zagupijalixi.myartsonline.com/7420878768.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 5072 bytes
SHA-256: dd8465f49f41a1166795cac5bf5ae2dae355fc05494ec6fa2dd7727698810d0c
font_01_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0001191d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191D 12032 bytes
SHA-256: 60cf29d907adaa14c38238370ae6196684f1c214d2e6c3b258c9197cb5f82a9e
font_03_sfnt_off000141b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B7 16340 bytes
SHA-256: 5524f903227ff292daeebc297c1f67888251e0d4f28055af68e7128295089c3e

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