Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5ad725fc5ff44b…

MALICIOUS

PDF

59.4 KB Created: 2020-11-26 04:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8b1037abe8ef43bc11cf80fb7dec9c5 SHA-1: 6e761c972eb2530a08109ecf0b3a57285e3e0f84 SHA-256: be5ad725fc5ff44b2ec6f8803d77f45d5b6bac0148277df167728e21e5943aaa
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, including a link farm to other PDFs hosted on Weebly, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'freemotion workout routine' and metadata from wkhtmltopdf, indicating a potential lure.

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-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://trafficel.ru/strik?utm_term=freemotion+workout+routine
    • https://seranogi.weebly.com/uploads/1/3/4/2/134265977/1308028.pdf
    • https://cdn-cms.f-static.net/uploads/4380080/normal_5f8cb9a82cda7.pdf
    • https://tozarezev.weebly.com/uploads/1/3/4/3/134374844/jotivofofotatipegazo.pdf
    • https://cdn-cms.f-static.net/uploads/4387703/normal_5f9a7d3c364c9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2234a839-92da-4ef8-badd-ceee256fa413/caa_de_azucar_minecraft.pdf
    • https://uploads.strikinglycdn.com/files/350bcf76-1061-4f2b-a7d0-61e688d05ffe/formulario_4949_virtual.pdf
    • https://uploads.strikinglycdn.com/files/190b9c72-4c17-4e2a-be20-71780a414add/22851063925.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/the_satanic_verses_in_persian.pdf
    • https://uploads.strikinglycdn.com/files/a79fc1a7-eed0-4989-8fb3-d7a3acba3469/sasifelalabakufago.pdf
    • https://uploads.strikinglycdn.com/files/552e3fd0-21e0-4642-a28c-a1024bc59a14/das-second_edition_test_processing_speed.pdf
    • https://uploads.strikinglycdn.com/files/f741dfe2-5f6a-423d-aa07-b191f67ab706/26724172754.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_off0000b0b4.bin
dd6744bc526737f7879a3ac101e4e7904a4e792140d9d1573a5a899471854eab
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B4 4524 bytes
font_01_sfnt_off0000c014.bin
c1886700ee1cfa924390c208f8b8832f0a583eb4e975212a4c09eef2accd110c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC014 9736 bytes