Malicious PDF — malware analysis report

Static analysis result for SHA-256 a283b66e1c3e8aed…

MALICIOUS

PDF

64.1 KB Created: 2020-11-19 21:54:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6e4f778265657f737d7340dd34b8a0a SHA-1: 36a4f14b51c5675b6f6a90f24e1d0d397a6c8fe4 SHA-256: a283b66e1c3e8aed8628207b079028072315f416381013acbc3e6365f73985a8
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high concentration of links pointing to disposable hosting services and redirectors, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/123?utm_term=e1+and+e2+reactions+mcat
    • https://dipakinujudisil.weebly.com/uploads/1/3/4/4/134468351/badabufaboputidumes.pdf
    • https://rurizurerenudiw.weebly.com/uploads/1/3/4/6/134649160/1606082.pdf
    • https://guvodirafed.weebly.com/uploads/1/3/4/4/134475496/5850595.pdf
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/26053aec4ff8.pdf
    • https://pudozewo.weebly.com/uploads/1/3/4/3/134311846/pajot_labawod_witorosasimema_dinug.pdf
    • https://datirelegewewat.weebly.com/uploads/1/3/4/3/134329883/rejuzetiji.pdf
    • https://rumorima.weebly.com/uploads/1/3/4/3/134307849/6146159.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a616c0a8-89a5-4150-9c57-e577c4b5f5f6/51507585914.pdf
    • https://uploads.strikinglycdn.com/files/b157fb6b-fa26-466b-a038-596114e421b7/columbia_college_contemporary_civilization_syllabus.pdf
    • https://s3.amazonaws.com/xotomisen/former_air_america_radio_host_crossword.pdf
    • https://uploads.strikinglycdn.com/files/2ad36329-d283-4a5f-8781-d85b59a9dc0b/sesapi.pdf
    • https://s3.amazonaws.com/jukoxisojow/16649277164.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_off0000c0b9.bin
12d3591c6a5edd75041fe219e96eed258d472cfeac2a3a7c934962c1bea40d5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B9 5196 bytes
font_01_sfnt_off0000d254.bin
bcee4ae0acc184770a4fb07ed82f9095dd6109d1dc17edbd611b808a991d3b23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 9832 bytes

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