Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa5259ff7de3de4…

MALICIOUS

PDF

71.3 KB Created: 2021-04-07 21:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bd94d6743843e8c019dd56872f35a828 SHA-1: d765c8650bc0b5e249e2c6f2bd53c0c6ec3cff3b SHA-256: 7fa5259ff7de3de4676f87355debd2ae4237b9de7134e48d3807554ce926a4c4
186 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 6

  • 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.
  • 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://dugedepap.ru/strik?utm_term=how+do+you+calculate+flow+area PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425759/normal_604cd91f17f88.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/OjejiAJ/all_stars_cricket_match_2015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_602714151d09d.pdfIn PDF document text
    • http://soferizefisaxe.iblogger.org/how_to_use_adjectives_in_french.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_6067d790b1fbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_603cfa85c91f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412896/normal_600e222a3dc84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504568/normal_6008bcfa4e4c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474723/normal_60167f17924c4.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/dgI1jjH/jodotiretuloxuka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_6a2d02809d2b48a2955daa45ca322fa3.pdf?index=trueIn PDF document text
    • http://tirujukixiw.epizy.com/46170546798.pdfIn PDF document text
    • http://ganenimipoje.epizy.com/piwakuzosibefunaxa.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_1d6f322557f54a8487df60cec1ba2d49.pdf?index=trueIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_f53000828e56411f8eaf2f813488d6b0.pdf?index=trueIn PDF document text
    • http://fifowubijevajiz.epizy.com/gekugasadidopen.pdfIn PDF document text
    • http://lurimoromi.rf.gd/diniwojov.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_ded24e2e68f740afbb4d37ce13189947.pdf?index=trueIn 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_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 4992 bytes
SHA-256: 9e3aefb085754bfef31dcb5a7b914362ef269ee832115a29553fcf452dba6291
font_01_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 10868 bytes
SHA-256: 9ea016d694baef5691a432c0757d2fe6720aaa9c9ebc973c80a09d49c05e1e21

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