Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f623cd7f94211ee…

MALICIOUS

PDF

68.4 KB Created: 2021-03-03 21:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 84909eaea1d2587c1a8c9e59134cbeda SHA-1: e4b8f836af547086e2f090330af6b8e433408a72 SHA-256: 2f623cd7f94211eea1066268b271e824cc5ccef1f19a54fc5153a77ad4e3d07d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains numerous external URIs, with a primary focus on 'https://jacksth.ru/123?utm_term=what+kind+of+oil+for+honda+1000+generator', suggesting a lure to a potentially malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying the PDF as a link farm on disposable hosting, likely used to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/123?utm_term=what+kind+of+oil+for+honda+1000+generator PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419826/normal_6002573d2a016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_6035f8aca05b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379355/normal_5ffb4fa561ef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458840/normal_6016fda5e3b2a.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/7KhjbN7/war_with_grandpa_showtimes.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/g6Gwqia/gladiator_true_story_apk4fun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_602813dfc372e.pdfIn PDF document text
    • http://laluwaraselolar.mywebcommunity.org/where_is_samsung_a51_manufactured.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/uigigje/gojazupimoz.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/lananiwonekiderojalu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479678/normal_5ff5fbcfb0e54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujobope.atwebpages.com/how_do_i_change_the_battery_in_my_siemens_rdh10rf.pdfIn PDF document text
    • http://jilevatawew.epizy.com/mezevumovuxamazuviku.pdfIn PDF document text
    • http://wafalox.rf.gd/docker_ubuntu_16.pdfIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/can_we_live_on_triton_moon.pdfIn PDF document text
    • http://jujageritoxo.atwebpages.com/gudofojigunideluxeg.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_off0000cdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEE 5264 bytes
SHA-256: 14170df41988ed63c46a32836b267eaced38668b8c33cd40a6ecb5872ed0ded1
font_01_sfnt_off0000dfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 10760 bytes
SHA-256: 860e35c7b1670944467c9b8febff1775a2b212c7c916a05ecbdd5dc4aa3af8da

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