Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf912f33eafb5b7…

MALICIOUS

PDF

65.7 KB Created: 2020-11-23 04:50:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad2628380719ee146f2e15e2b87a1677 SHA-1: 16c7f8aa85bc45e5c35de432904c3c79d335c310 SHA-256: 1cf912f33eafb5b7eb78547138b137b5126e465e615255dfa0a0eb69ee9fc6b4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://trafficel.ru/123?utm_term=calcium+phosphate+ionic+or+molecular', is likely part of this scheme. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external content.

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/123?utm_term=calcium+phosphate+ionic+or+molecular
    • https://kezevamu.weebly.com/uploads/1/3/4/2/134266298/3595227.pdf
    • https://cdn-cms.f-static.net/uploads/4411691/normal_5fae732242c4b.pdf
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/sebupabi-sagixo.pdf
    • https://dawiganolakegoz.weebly.com/uploads/1/3/4/3/134367714/lopar_rupikubipopo_jagenitipo.pdf
    • https://dogiwubof.weebly.com/uploads/1/3/4/4/134400908/839bf4ba79570.pdf
    • https://cdn-cms.f-static.net/uploads/4470024/normal_5fa57b0bce1e6.pdf
    • https://dudezixibuwido.weebly.com/uploads/1/3/4/5/134529197/af92b1.pdf
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/kelasej.pdf
    • https://cdn-cms.f-static.net/uploads/4447098/normal_5fb8b6007e5dc.pdf
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/4850111.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dadupawo/bimipuwiwavivizegup.pdf
    • https://s3.amazonaws.com/jifesu/rofamekifuxof.pdf
    • https://uploads.strikinglycdn.com/files/cd7f3e74-3179-4ab5-8df5-ece0ab1f3bd8/shadowhunters_season_3_episode_4.pdf
    • https://uploads.strikinglycdn.com/files/847d3376-c0b5-4a0f-913a-bcdcb51b2a03/56766779786.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_off0000c687.bin
5c9db65eb4a0ba85ff310e9360ff8df4d8972e9dfa3fb084d2aba0ed57713844		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 5076 bytes
font_01_sfnt_off0000d797.bin
6db4aa6483b82cc7975bdf5f929101259ca3537ff01f79d135f677cc4f94e701		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 10076 bytes

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