Malicious PDF — malware analysis report

Static analysis result for SHA-256 a587f4fd6cefd4a5…

MALICIOUS

PDF

59.1 KB Created: 2020-11-14 12:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b676263d882a8c05db0e1e2ef9dc781 SHA-1: 9d7e2b786e91cde0f1d63d506fa8914535197ffb SHA-256: a587f4fd6cefd4a53ae8f0a3587b52e3f7b94d9fb41708a0c7c1dc8e8428d4a8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The embedded content, though heavily obfuscated, suggests a lure related to streaming content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution via the linked sites.

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://traffine.ru/123?utm_term=this+is+spinal+tap+streaming+vf
    • https://popilezofale.weebly.com/uploads/1/3/1/1/131164236/6132707.pdf
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/kevojimawawa-defowelok-dinoraku-weder.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2483304e-72db-4329-acdd-ebf08f370017/58248270729.pdf
    • https://uploads.strikinglycdn.com/files/57259f04-1bbb-4c13-a637-80afa326c1c8/nodenerigeximago.pdf
    • https://uploads.strikinglycdn.com/files/45c9692e-99e7-4487-aeef-55163336d808/kudeva.pdf
    • https://uploads.strikinglycdn.com/files/6623f88f-d2af-46f6-a160-7810d0fa5783/44057888812.pdf
    • https://uploads.strikinglycdn.com/files/e621f7e0-26df-4424-b0d3-632dadd43f59/ropofazuritebumuj.pdf
    • https://uploads.strikinglycdn.com/files/4ad06a04-55d4-482d-a1ae-6a8bdcddd646/jiluzofiluwasepobifomaka.pdf
    • https://uploads.strikinglycdn.com/files/6248da4b-f4aa-439b-827a-6544730c8709/iso_7919.pdf
    • https://s3.amazonaws.com/safago/loguwun.pdf
    • https://uploads.strikinglycdn.com/files/4fb810cd-e994-46ec-834a-c70081343d55/gapexitofofe.pdf
    • https://s3.amazonaws.com/kawotexulozax/867112801.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_off0000abf3.bin
bc9a76534d86ee860be0332da57b467e5ad667779d4adff297c289259651b55e
pdf-font-stream PDF embedded font (sfnt) at offset 0xABF3 5324 bytes
font_01_sfnt_off0000bded.bin
f9b233f757be771885ab9dc26cf152700e0f91c39a4d404b15fbbb4e4e38edc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDED 9896 bytes