Malicious PDF — malware analysis report

Static analysis result for SHA-256 8390049e4cd7d4ea…

MALICIOUS

PDF

71.8 KB Created: 2020-12-18 07:56:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 316f574b815567e66a42ec541b64a8db SHA-1: 5c41829d721e70239445414c4e9a30f21b301e6c SHA-256: 8390049e4cd7d4eacbc531339cb49a14f6737527011a43feaa414e31403dc00c
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 one pointing to 'trafftec.ru', suggesting a link farm or redirection to a malicious site. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality, potentially for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=chevy+350+rebuild+kit+autozone
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f89ca8d8c2b3.pdf
    • https://nolalitikobuno.weebly.com/uploads/1/3/4/7/134768790/rajibor.pdf
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5f92432eb26b8.pdf
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/3960037.pdf
    • https://cdn-cms.f-static.net/uploads/4455894/normal_5fbfab09d5f32.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7b830506-fbb1-41bc-84b4-3afd9d6d7a87/39877163740.pdf
    • https://uploads.strikinglycdn.com/files/8afe08e5-8509-4b03-ad27-415a240b6522/serebulanebitizegaregoga.pdf
    • https://static1.squarespace.com/static/5fbfd56316f6d44b07b8b81c/t/5fc0dbef08845d0924aa3c44/1606474735471/shelby_county_warrant.pdf
    • https://uploads.strikinglycdn.com/files/3461f80a-4624-4f25-a16b-b4fd6dce5d0d/51059856362.pdf
    • https://static1.squarespace.com/static/5fc1a55868612547ed6365a0/t/5fc72226a907d7439cd47928/1606885929124/60571935774.pdf
    • https://uploads.strikinglycdn.com/files/522238f9-8e86-4343-b300-b33633a088ab/coin_hacks_for_madden_20.pdf
    • https://uploads.strikinglycdn.com/files/f08393f0-9e0d-4246-b969-339e21fdf2fb/vuxinevojano.pdf
    • https://static1.squarespace.com/static/5fc118f0bdb33045eec37880/t/5fcf374524ae147ef3d8ef77/1607415621793/chess_endgame_training_rosen.pdf
    • https://static1.squarespace.com/static/5fc668c6085bf90c0e22d7bb/t/5fc8031e5bac470238ee33e6/1606943520999/ocean_dream_meaning_christian.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb3a.bin
c8ae5c060cfb8ecc4dda065262c04081ce7f7f732d83486474b5e4f9ef1f5f33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 5488 bytes
font_01_sfnt_off0000ddf5.bin
08f6a7812f40a11464f4300eb3a2cd5a35c975447514824de8dfcfcffa9b5bf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 11188 bytes
font_02_sfnt_off0001042e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 4324 bytes

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