Malicious PDF — malware analysis report

Static analysis result for SHA-256 07e3969dac27f08c…

MALICIOUS

PDF

78.5 KB Created: 2021-03-31 05:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c081ec136a88763f2e9c1b1f6bcae4e3 SHA-1: a95c061b10203aa8ce187203a9b2a49a4ace9aa4 SHA-256: 07e3969dac27f08c5e2b73ff53a9a6873382436ac6682398e7a408a4ea1070d9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, with the primary URL being https://dafemum.ru/award?keyword=annotated+bibliography+example+pdf+mla, suggesting a link farm or SEO manipulation tactic. The presence of embedded JavaScript, though not fully detailed, points towards potential malicious scripting capabilities within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/award?keyword=annotated+bibliography+example+pdf+mla
    • https://cdn-cms.f-static.net/uploads/4480889/normal_604d47abd92d4.pdf
    • https://guxiwejibu.weebly.com/uploads/1/3/4/9/134902351/068f57c10.pdf
    • https://lelusujizuzu.weebly.com/uploads/1/3/1/4/131438438/vokirozulem.pdf
    • https://gizetaxawu.weebly.com/uploads/1/3/1/8/131871526/gofamiludis.pdf
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/silamesatafiva.pdf
    • https://lideteli.weebly.com/uploads/1/3/0/7/130775407/8196637.pdf
    • http://ritegifufefut.scienceontheweb.net/fubudasofuvagukatepajunam.pdf
    • http://tanenabav.getenjoyment.net/fanamokasaxodasupenog.pdf
    • https://static.s123-cdn-static.com/uploads/4426557/normal_5fef5538021c2.pdf
    • http://tojuvapemupo.mywebcommunity.org/27697378850.pdf
    • http://xitodefigatefuj.medianewsonline.com/best_stock_for_2021_to_buy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://daximogosamov.myartsonline.com/13185816422.pdf
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_82c34d9691bb462e9717923860053d7f.pdf?index=true
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_a70f8ceb6ed34b8284218dbf3bd6fcf7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cd50955d-7a8d-425b-b791-6d43f01a6a86/gujitexanemilimupinude.pdf
    • https://uploads.strikinglycdn.com/files/35ddd359-c2a7-4b40-a19d-50c59ee8c277/hp_laserjet_m1212nf_mfp_wireless_setup.pdf
    • https://uploads.strikinglycdn.com/files/6c6b1895-082f-4e5c-82e8-7bc38e38ae62/el_guardian_entre_el_centeno_resumen_capitulo_13.pdf
    • https://uploads.strikinglycdn.com/files/5451e757-1622-4f2d-8348-f3b28bcacf9e/muraxefikexewofu.pdf
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_d8395d5e50ee477eba175ab799134b1e.pdf?index=true
    • http://romepasuv.myartsonline.com/lefoko.pdf
    • https://uploads.strikinglycdn.com/files/222d12e4-755a-465b-8401-4ccc870632e7/37297696238.pdf
    • http://kepofif.onlinewebshop.net/decimal_number_line.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_off0000f5cd.bin
cc3467d334e810f2cde0ac3a93eb0d1d8831fbdd6c013f6485992728c3b698da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 5576 bytes
font_01_sfnt_off000108a9.bin
739f91aafe79b94f42fe6df04066d6eed6f33d2387bdaca09215d53e03a98545		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 10676 bytes

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