Malicious PDF — malware analysis report

Static analysis result for SHA-256 48927e70d175f1c6…

MALICIOUS

PDF

99.5 KB Created: 2021-04-21 21:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4a181bb70a2b83c1b8677d8728c8741f SHA-1: 102add94ef3e1bd0dbe22626107d2dd46e97f94c SHA-256: 48927e70d175f1c676a80d1c3421401a713ac6bfde0fa8513b9baeaf51b31de7
186 Risk Score

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-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.
  • 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=throne+of+glass+summary+no+spoilers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417318/normal_605b25101c2f7.pdfIn PDF document text
    • http://biwiroxefamir.mywebcommunity.org/microbiology_and_plant_pathology_books.pdfIn PDF document text
    • https://kopomitesukov.weebly.com/uploads/1/3/1/4/131453216/7706555.pdfIn PDF document text
    • https://bodukomemewasug.weebly.com/uploads/1/3/4/7/134701633/ponavam-sowajotomowe-kixuzirelupe.pdfIn PDF document text
    • http://nejuwenazi.iblogger.org/septic_arthritis_adalah.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467927/normal_5fdfb7f44dc7c.pdfIn PDF document text
    • https://migapivali.weebly.com/uploads/1/3/1/3/131381101/barirevala.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/7413366.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/3193558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_6041f33bf23ea.pdfIn PDF document text
    • https://wegetifadozapuf.weebly.com/uploads/1/3/1/6/131637062/takazivos.pdfIn PDF document text
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/8760221.pdfIn PDF document text
    • https://duxobibalarig.weebly.com/uploads/1/3/4/3/134360367/d1238be5935fb9.pdfIn PDF document text
    • http://vudujupuboneg.22web.org/relative_clause_reduction_exercises.pdfIn PDF document text
    • https://vanosejifewufe.weebly.com/uploads/1/3/0/8/130814052/5688545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_603f9ca387da7.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/juvizidoboxaga-xirepupi-xegut-kanuxipoma.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/wesopa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_b7b7d4c2ef3d470baa10925dc8f5de49.pdf?index=trueIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_5190733778e04497b716600b0407e702.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_off000147b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B2 5368 bytes
SHA-256: 1ec51ca4ba6ea5e0939a5164ba29cab576b8a4e9396814bb572778aa669ad7c2
font_01_sfnt_off000159d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D4 11236 bytes
SHA-256: dcdae3ecb2bb71b0537b401ac4eb1ff62b9214f395ca400cf845096e35ae7c29