Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b511710f48527c3…

MALICIOUS

PDF

78.6 KB Created: 2021-04-04 02:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cafa425f09fe30040066717b7da8e8e8 SHA-1: 2655f31c87f56b04db7ba0c4efca8a0f4c530eca SHA-256: 0b511710f48527c3ce840deb1e3ad27878cdbd02706809314e35ebd531d0d708
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous external URLs designed to redirect users to potentially harmful content. The presence of many disposable hosting domains and UTM parameters suggests an effort to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=spalding+basketball+hoop+parts+%2526+accessories PDF link annotation
    • https://sojuseruk.weebly.com/uploads/1/3/4/3/134367588/zuxazinasaxonum_dafesajugabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_6058181abbcdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374698/normal_5fe18533c1356.pdfIn PDF document text
    • https://toxazuna.weebly.com/uploads/1/3/0/9/130969920/laveboxirupisasaxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495059/normal_5fcd3c6a16774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5fcc9f19db2ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484633/normal_5ff64b05bf031.pdfIn PDF document text
    • https://gikotibosad.weebly.com/uploads/1/3/4/3/134332820/sigozaranam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495042/normal_6055ca5a0c145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487916/normal_605d87b0e4f1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_60665cc7e0a4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418970/normal_5fc6719d4a02a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_5fd2a6f1d228c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zezewesiwakoruw.rf.gd/facebook_lite_mod_apk_apps.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_6bc58b9c453541ab806f5bc956b0832f.pdf?index=trueIn PDF document text
    • https://cb705b04-a904-4f11-a6d0-9d7e2b1ae5cb.filesusr.com/ugd/53498d_5ce588911e154549b154bb927e65185b.pdf?index=trueIn PDF document text
    • http://joveteki.epizy.com/42922204995.pdfIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_1b4ac529763a46f09270d296a8a0dc72.pdf?index=trueIn PDF document text
    • http://gawuvuv.epizy.com/vpn_express_apk_premium.pdfIn PDF document text
    • http://nifopufu.epizy.com/22458384704.pdfIn PDF document text
    • http://zamusokekegu.rf.gd/possessive_pronouns_exercises_with_answers.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_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 5528 bytes
SHA-256: 9f09b0a193bcee30efba8c11ea8cab4edaebb30f0819d2b31178ecb90e36063a
font_01_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 12144 bytes
SHA-256: e6c799706536eb8327f244437552c0b6cd41b51ec2c6be46dfcc30cb73c3cfad