Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75f7fd7e0e86df3…

MALICIOUS

PDF

71.8 KB Created: 2021-02-16 01:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 04ccbbb100776d569ed71b0e2ac54ebf SHA-1: 23e804f454224e90d249b91482c3f9a406ad3371 SHA-256: a75f7fd7e0e86df319a5268132f956bea4c8820edf74658b84da069457911053
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-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://baarspo.ru/wix?keyword=apk+keuring+zaterdag+amersfoort PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427313/normal_6015ae284dd6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366015/normal_5ff2272e2ebec.pdfIn PDF document text
    • http://pobalulegofi.22web.org/32691093812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_6016b48702dab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493597/normal_5ff30615176f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450630/normal_5ff5d3525f45b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499979/normal_5fce73efc70ce.pdfIn PDF document text
    • http://guketaz.iblogger.org/turtles_all_the_way_down.pdfIn PDF document text
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/505219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464065/normal_5fd7b3951f931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_5fdb73544ee01.pdfIn PDF document text
    • https://xaburopufazig.weebly.com/uploads/1/3/6/0/136051881/5441478.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suxijiwuxupan.epizy.com/juxajovuba.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/kijerofolemagepozubuz.pdfIn PDF document text
    • http://zogivumomu.epizy.com/ciel_rodrigues_mil_vidas.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_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 5432 bytes
SHA-256: 75e26ceb0079daf0a7fdebcf164e29e7b16bbee79008b3262529d20ec7f83b46
font_01_sfnt_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 10752 bytes
SHA-256: f840538f073d588e9f671880f4885ddbb1342ece545731851716b0c70b280364

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