Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbb150bca9729f5…

MALICIOUS

PDF

70.5 KB Created: 2020-11-12 13:33:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87f1162a0e0d8d6d277b975a3881037f SHA-1: 71c8073f7f2f8f5975eabe51703901e2a8f5f250 SHA-256: fdbb150bca9729f5839d3e48f36987bd2c30049b6ca36c0b48f54459881a0880
156 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or a mechanism to distribute further malicious content. The document body, though heavily obfuscated, contains text related to financial tracking, likely a lure to disguise the malicious intent of linking to other potentially harmful files.

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://traffine.ru/aws?utm_term=excel+sheet+for+expenses+and+income
    • https://cdn-cms.f-static.net/uploads/4385863/normal_5f93d74542995.pdf
    • https://safikevobajegev.weebly.com/uploads/1/3/4/3/134352312/819571fce059246.pdf
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5fa9713e2f6f8.pdf
    • https://japiloxekafu.weebly.com/uploads/1/3/4/4/134480389/7254475.pdf
    • https://cdn-cms.f-static.net/uploads/4408184/normal_5fa6b08c2222f.pdf
    • https://rineragafuvotut.weebly.com/uploads/1/3/4/4/134442037/lirifupafizake.pdf
    • https://bebefezagogu.weebly.com/uploads/1/3/4/3/134372182/bijokebelomagejawaja.pdf
    • https://cdn-cms.f-static.net/uploads/4426813/normal_5f9c52bb60401.pdf
    • https://cdn-cms.f-static.net/uploads/4410211/normal_5f9967a9dfefc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/39aaae26-1e82-4d91-a854-e320ba54b54b/41041997721.pdf
    • https://uploads.strikinglycdn.com/files/c35e830d-a99d-4d6a-85dd-273ea6db839d/sofam.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_off0000c9db.bin
fd9bad2ebb71f3946165262a45df0ed880ffc2ad03f50a144661d309e7307534
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DB 5208 bytes
font_01_sfnt_off0000db53.bin
1ea8146e9c93cc4d11842e6c30f23657fd34581a151a92ee7b8e6000638c7464
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 10548 bytes
font_02_sfnt_off0000ff3d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 4324 bytes