Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba976e84990cf82a…

MALICIOUS

PDF

79.8 KB Created: 2021-03-06 17:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ac2dc66ec5cd50f9bdfd6bced416cc97 SHA-1: bec0d6bf322b72a29afb7d20be55dab4c29ebe71 SHA-256: ba976e84990cf82ad632333be9be18505428ddda7c73fe1d4ef63dfba5afdd16
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/wix?keyword=tiny+tanks+unblocked+google+sites PDF link annotation
    • http://xawamiwupajev.mygamesonline.org/lather_and_nothing_else_main_idea.pdfIn PDF document text
    • http://fodelogutejamit.getenjoyment.net/figevatuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_601146db97575.pdfIn PDF document text
    • http://wajazenizur.mywebcommunity.org/45299085564.pdfIn PDF document text
    • http://torchland.xyz/wujewosaxalimeweloxii715r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_601e87e4904d0.pdfIn PDF document text
    • http://tabikola.online/66937177671z0f4j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_6042b68e2d1ed.pdfIn PDF document text
    • http://poverkavoda.website/system_architecture_diagram_template4zh0e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c3e46630-acf8-4459-a8ed-3317c14a650f/craftsman_18_chainsaw_reviews.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_baffece7bef84447a42d1a34ed777653.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_75d29b18a3884ab6bf1d979c3a7699a2.pdf?index=trueIn PDF document text
    • http://zisukuvi.atwebpages.com/why_is_the_gypsy_moth_a_problem.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_1fc12efca3044c30992835b2ea732465.pdf?index=trueIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_4562b060c7974a0989f33404e9b6d96a.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_00425e213bf349feb2144fc348fefbad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33209229-43d9-4e29-9fa5-87d28951de2a/quadratic_equation_vertex_form_calculator.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/53208283807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af8819b-d125-49d1-b255-a26683d25788/fazodupazolibarefutesir.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_1058e7cfddab494dabea157ffbec46dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be73bfe6-a98a-4296-adf4-46004fc34346/64344713559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/662643ff-d253-43d3-b44f-a8d89037281f/whirlpool_gold_quiet_partner_iv_reset.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_a70c25889f9846f486a47a6c7ecb7cb7.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 5148 bytes
SHA-256: 2a779c0a192bc949ebb9baa5fdee5540f2c24bf85fc1b7ece88d90ab96ef9e30
font_01_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 10652 bytes
SHA-256: 0556120d40fcee2de16f294fa5e053198c3182be0024cea0379620c9c6652e7a
font_02_sfnt_off000123aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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