Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1856a64a98a30e4…

MALICIOUS

PDF

73.7 KB Created: 2021-03-27 12:15:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 84e620e4440d6e50b05d03be0fdf12bd SHA-1: 2f989487a948d19260f0717087144c5f5861dedf SHA-256: a1856a64a98a30e4d400aa32936e37b6870be5ea699df9f435c3354bc2d061b5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to a malicious site, likely for credential harvesting or second-stage payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=poisonwood+bible+pdf PDF link annotation
    • https://cdn.sqhk.co/tojebaru/3idMhbD/apple_tv_just_dance_controller_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453747/normal_6010938e12de2.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/rozem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467950/normal_60279038aeaff.pdfIn PDF document text
    • http://paruxezogu.mygamesonline.org/2691439351.pdfIn PDF document text
    • http://xebasebidigu.iblogger.org/gorotowizasufimub.pdfIn PDF document text
    • http://kewisanoxiv.66ghz.com/83707895890.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/hGsGfzQ/86678361088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_600c729390e07.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/jgj7ja0/wiguvep.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/83568523803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488322/normal_600c94237144f.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/g7i5jgP/shark_evolution_mod_apk_revdl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387412/normal_6027729812e98.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/ifeehh9/narugofu.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/f8e64e8a-5217-4e6b-907a-04f666061b04/49217615265.pdfIn PDF document text
    • http://bopewexe.onlinewebshop.net/43675602164.pdfIn PDF document text
    • http://govatojajij.epizy.com/benixutexetedolozaj.pdfIn PDF document text
    • http://rafetomobu.rf.gd/proper_assisted_pull_up_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23359bb9-90a0-4970-98d9-9f610dc199fd/tawukoliwesumuritufejase.pdfIn PDF document text
    • http://niragagazako.rf.gd/xanimamapabajokipupaw.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_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 4960 bytes
SHA-256: 1aedb182204602d5c87e17d5cddbbc322369e93f8f934d2026c8e8ccd2306027
font_01_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 11148 bytes
SHA-256: baa7f418df06fc549835c738a8b900a40e420be1d3b2b9b364f6cd7c3b56897b

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