Malicious PDF — malware analysis report

Static analysis result for SHA-256 573c957b60d95d5d…

MALICIOUS

PDF

84.6 KB Created: 2021-05-13 03:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8ca1d3dfd1e36497836aac7f6a8a0346 SHA-1: 7872365099085d3cd5fd85eba3e2eb5485ee7473 SHA-256: 573c957b60d95d5d62f14b50ce98a9f251e9e75d61c9a1e3f79b447755ae69d9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=2015+washington+redskins+cheerleaders+roster PDF link annotation
    • https://gibonubud.weebly.com/uploads/1/3/4/8/134877094/c5e3f39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483083/normal_60297436c0b64.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/pukefimademixabawi.pdfIn PDF document text
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/bikulomefog-pajigajujigal-xurez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401546/normal_605efc5ce1157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_600d61c99336f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_6024afa59426c.pdfIn PDF document text
    • http://golifidisonopat.iblogger.org/10th_step_inventory_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420025/normal_605604672ef15.pdfIn PDF document text
    • http://nunelix.22web.org/baby_boy_names_in_kannada.pdfIn PDF document text
    • https://gekaketiba.weebly.com/uploads/1/3/1/4/131455198/4310125.pdfIn PDF document text
    • http://vejuwetuk.mypressonline.com/7225920020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sijopar.epizy.com/channel_13_news_orlando_reporters.pdfIn PDF document text
    • http://rolizixi.rf.gd/xirodudasusituzew.pdfIn PDF document text
    • http://dadinubu.rf.gd/8505627150.pdfIn PDF document text
    • http://fonunegemo.epizy.com/guide_to_effective_instruction_literacy_4-_6.pdfIn PDF document text
    • http://kujujigufa.epizy.com/berituwaju.pdfIn PDF document text
    • http://mejovusemuvov.rf.gd/mofomu.pdfIn PDF document text
    • http://palipesokugukux.epizy.com/87548299669.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_off00010b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3B 5712 bytes
SHA-256: e3989cd777a285ab9ac789081214498c0930d93d174c1528f812af13d9abfb26
font_01_sfnt_off00011ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 11452 bytes
SHA-256: 0c96869deb689ebb06b8d2432f610b6c9189c14b2dc01bb735ce4eae004a6fd5

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