Malicious PDF — malware analysis report

Static analysis result for SHA-256 b856d69c1f3f76c7…

MALICIOUS

PDF

68.6 KB Created: 2021-01-22 10:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bf8186c6b3ad85482ff3913a4e9c4863 SHA-1: 9ebfa8eb9626c43bc7cdde79fb83320afe85e855 SHA-256: b856d69c1f3f76c72d617d714879e700fc4277d20fc15c372bc89a12a7b5ee17
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 pointing to disposable domains and likely part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

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://jottigo.ru/123?utm_term=nevaeh+buchanan+mom PDF link annotation
    • http://berozava.iblogger.org/57467767755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469850/normal_5fe98182d7d30.pdfIn PDF document text
    • http://nemekarasika.iblogger.org/13230679185.pdfIn PDF document text
    • https://ganuwikudafo.weebly.com/uploads/1/3/0/7/130775291/pumiji.pdfIn PDF document text
    • http://rabisoluvilava.iblogger.org/mowotujuvakulukaluxer.pdfIn PDF document text
    • https://sujebufapu.weebly.com/uploads/1/3/1/3/131379792/0c7a9c91cde.pdfIn PDF document text
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/bojid.pdfIn PDF document text
    • https://zumizosapozogem.weebly.com/uploads/1/3/2/6/132681504/7336f4f53.pdfIn PDF document text
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/3421465.pdfIn PDF document text
    • http://pepirizibizedel.22web.org/blackmart_apk_2018_ios.pdfIn PDF document text
    • https://jebovemedafo.weebly.com/uploads/1/3/0/8/130813903/bifevikubuvuzaw-dadov-lofusodigus.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/gitabukumolido_suxigatafe_tajewamidebemij_repakedagapi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulawev.epizy.com/fobipitulurak.pdfIn PDF document text
    • http://nebejobibaveb.epizy.com/agrahara_gold_application_form.pdfIn PDF document text
    • http://pupuwejerew.epizy.com/52131964811.pdfIn PDF document text
    • http://pasigajixivete.epizy.com/kiroxawumuzijisikavi.pdfIn PDF document text
    • http://dalefiza.rf.gd/xewakim.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_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 4904 bytes
SHA-256: 4014b6cc4aeda7c0407631e00fa46a38e23a0188555dc99bba48f4204d59fe3a
font_01_sfnt_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 10172 bytes
SHA-256: 9552209789447c73924e3d72fcc0d02d05895e64a729e89457d2f4e0d0459dc4

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