Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e5e43cc5442e6ff…

MALICIOUS

PDF

65.9 KB Created: 2020-11-14 10:38:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 548cc2e45ae72834faf99737a9f46802 SHA-1: 1b15f661352199c6003d04f90220ae9ab0613284 SHA-256: 0e5e43cc5442e6ff73a42dddde0b8d006598cc8646c32a5a36c0d29925baf394
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it is part of a link farm designed to drive traffic to potentially malicious sites. The document body, though obfuscated, contains keywords related to online exercises, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://trafficel.ru/aws?utm_term=binomische+formeln+%25C3%25BCbungen+online
    • https://kepamimap.weebly.com/uploads/1/3/4/6/134609022/91ec36744f.pdf
    • https://donibirumot.weebly.com/uploads/1/3/4/4/134463545/3180055.pdf
    • https://cdn-cms.f-static.net/uploads/4384296/normal_5f96bcbbbb418.pdf
    • https://senoxifogixuj.weebly.com/uploads/1/3/4/7/134769413/8e495f6cc2.pdf
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/gapawibales.pdf
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/bepimaxixenowobir.pdf
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/gebufe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e3ade5c5-6fb7-4826-9bf7-b9d636642ff6/15251474344.pdf
    • https://uploads.strikinglycdn.com/files/3a3ac84c-4248-41ac-a671-9263e224a335/gafedesipezo.pdf
    • https://s3.amazonaws.com/mawesenasijoser/final_fantasy_exvius_pc.pdf
    • https://uploads.strikinglycdn.com/files/b656d10f-494d-4e84-89d4-216dbb1e6b8d/18430169794.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_off0000c0f1.bin
161cf35ed1f248b45fbef285f94a0c4274f8a4443196e5f2e368c148eb36ddf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F1 5396 bytes
font_01_sfnt_off0000d2f4.bin
7844b02a16066db3c8d48938e3567af36e77b3ab3241cc70ea832bf4e288a155		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 11664 bytes

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