Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60673d5697ff687…

MALICIOUS

PDF

72.5 KB Created: 2021-03-28 09:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a4231513305567a2d166b841da007d9 SHA-1: 7f63dc577b54fdb735d9c214b997f3ae2a11ebaa SHA-256: c60673d5697ff6873c7f2546c3cb304f6c5191f41ab05c0c91a13e712dff1977
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://nipisod.ru/wix?keyword=one+man+two+guvnors+full+script+pdf', indicates a lure to a website disguised as a search result. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. No scripts were extracted, but the structure and external links strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=one+man+two+guvnors+full+script+pdf
    • https://juxapokidopelif.weebly.com/uploads/1/3/1/6/131606881/7734824.pdf
    • https://satepiwe.weebly.com/uploads/1/3/5/3/135350267/6972876.pdf
    • https://cdn-cms.f-static.net/uploads/4454048/normal_5fdbe159f1b89.pdf
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/338251.pdf
    • https://xasizitip.weebly.com/uploads/1/3/1/3/131383358/nelerizi.pdf
    • https://cdn-cms.f-static.net/uploads/4404529/normal_6050fbf7d7a74.pdf
    • https://static.s123-cdn-static.com/uploads/4423428/normal_5ff6162267285.pdf
    • https://lidimegofomizut.weebly.com/uploads/1/3/1/3/131380930/xoxegenavipurumipop.pdf
    • https://cdn-cms.f-static.net/uploads/4410431/normal_6057a489b7e48.pdf
    • https://fazajamol.weebly.com/uploads/1/3/2/7/132740605/2f6be00795.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tesasubawalozan/android_datetimepicker_dialog_example.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/bootstrap_4_offline_documentation.pdf
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_b919f67129b3438cad1a4f03a975adc4.pdf?index=true
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_2ddae288fec54b809ad5b17e48049b0e.pdf?index=true
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_4df1ef48591a43aa91e1f896f33af749.pdf?index=true
    • https://s3.amazonaws.com/bubisifapagefe/integer._parseint_java._lang._numberformatexception_null.pdf
    • https://s3.amazonaws.com/lovomijelun/fda_guidelines_for_weight_loss_drugs.pdf
    • https://s3.amazonaws.com/lopadivupudexa/6668368350.pdf
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_a09a77a1626c4b4fbe34fa506a4caafc.pdf?index=true
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_5f8bee01d57d415e9656444e6eec8ebf.pdf?index=true
    • https://s3.amazonaws.com/vexosafugunu/value_of_modulus_of_rigidity_for_mild_steel_in_n_mm2.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddbc.bin
4c47ddf18bee4b000cf8cb6a1c673046d4f23d62f015afc0ef88e20ba2fa963d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 5656 bytes
font_01_sfnt_off0000f0f7.bin
599d91a442fabd960a2e23eba6f275f881381da765328918c45b9b8034dbac57
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 10388 bytes