Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0471eaaaf5ba10…

MALICIOUS

PDF

80.5 KB Created: 2021-06-13 03:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b3cfac5dce7b3c170febfbb291d8716f SHA-1: 1b234d3f578231648d13ade7984826581f286346 SHA-256: 0a0471eaaaf5ba1049c2534a6deb47ce46f44fbb2d85273a70576b245037b448
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 0.9996

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://smidgel.ru/pbw?utm_term=jetblue+ipo+valuation+case+study+solution PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484999/normal_6065dc72e4b24.pdfIn PDF document text
    • https://sulorajezute.weebly.com/uploads/1/3/4/8/134854577/4245851.pdfIn PDF document text
    • https://putujagojosid.weebly.com/uploads/1/3/0/7/130738675/nuwasesafinin-mamokokivamarin-duluzupovukiso-venenorobewu.pdfIn PDF document text
    • https://tavovoxiwazufaj.weebly.com/uploads/1/3/5/3/135325502/7971036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_601fc9d5d2b99.pdfIn PDF document text
    • https://xatawozenovug.weebly.com/uploads/1/3/4/8/134886035/3078008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370284/normal_606cab4700c5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fe8a79186883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_6013308b0f45a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458150/normal_605a639739d0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5fe49c588a711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382639/normal_6058b2f677fb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454550/normal_6019d8a2959d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/62da13f7-d204-401e-98eb-4d2d0e1b751b/silafajet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffae0453-2629-46aa-9fa1-55d057d8a2e1/wejusalotekidajases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe7e2e73-4619-4f60-a1a5-697836492dab/how_to_make_a_sad_person_happy_over_text.pdfIn PDF document text
    • http://vogituvu.pbworks.com/w/file/fetch/145223106/working_effectively_with_legacy_code_by_michael_feathers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae5bff7-55d5-49d5-8132-568f1f0b9cc2/dark_souls_3_fun_builds_pve.pdfIn PDF document text
    • http://jetubabup.pbworks.com/w/file/fetch/144564735/xijopoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d2bb5e4-9cfb-4d9c-84e6-f2033318e9a9/behind_closed_doors_dateline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20c6d9c-afea-456a-831f-25b1b17764d8/ruwedulimopavidana.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_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 5260 bytes
SHA-256: 39fdeff218659dae3370a31e88f0f7b12c3dcfaaafc69923ca705ce638de237e
font_01_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 10836 bytes
SHA-256: 293706ff6ccfa33217348a357a1299c63128b800a0d1df45856ba027771d33ff