Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3eb76f96252d84…

MALICIOUS

PDF

113.8 KB Created: 2021-02-25 08:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 234e44386f6d2ac7cf8ed56e5a9da517 SHA-1: d263649b6cdac09e111a9ee1e820d6ebdd46a86c SHA-256: bc3eb76f96252d84b18bfb1f252d062aeffb271a63af0a9bffb293f3a2565ab8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and are structured in a way that suggests a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious content.

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://maypoin.ru/award?keyword=my+favorite+things+john+coltrane+counter+numbers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5fd6759ab9c17.pdfIn PDF document text
    • http://ijmalan.xyz/farm_animals_clipart_blackepm5g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452593/normal_60300e3209511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412908/normal_600dabdb73ad2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365570/normal_5feb8e83832f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_6018326da1f93.pdfIn PDF document text
    • http://hargotel.xyz/why_is_the_naturalization_act_of_1790_significancepyh2z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_60246d9fb6862.pdfIn PDF document text
    • http://epaytds.xyz/free_android_emulator_lite7pgll.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453729/normal_6036af7c7bffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_6016795cf1b6f.pdfIn PDF document text
    • http://robolab.one/dr_emma_hcg_diet_reviews2lp3y.pdfIn PDF document text
    • https://masevaru.weebly.com/uploads/1/3/5/3/135346062/jaxoneri.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/what_are_other_words_for_left_alone.pdfIn PDF document text
    • http://zootime.store/motinenemizedufokutewusa8c8uh.pdfIn PDF document text
    • https://rojisubul.weebly.com/uploads/1/3/4/5/134593633/9bc99.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/mipel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_6030a4bad4ea5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000182fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182FB 5676 bytes
SHA-256: b16ce61d5f9f46284c3ef00530dd18902628ab21d053f43fadfc3813e682a8aa
font_01_sfnt_off00019650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19650 10324 bytes
SHA-256: 48fb7db94e800803c0b84c9f27efaaa51e5e42fd1c734bc4555ce95381ba20a9

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