Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d0b2d63acbd8ec…

MALICIOUS

PDF

71.5 KB Created: 2020-12-23 07:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb42a5c75044d02217319f2bb623eccc SHA-1: d43eff8ccc60706407276cb9d11f69883e45cbaa SHA-256: 59d0b2d63acbd8ec6baafedea310861265666307c5856ae618f83b9d7721d3c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'trafffi.ru', suggesting it's part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF's purpose is to host many links on disposable domains. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's used for phishing or distributing further malware.

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://trafffi.ru/123?utm_term=make+your+own+spot+it+game
    • https://cdn-cms.f-static.net/uploads/4415526/normal_5fb5efeb60c8e.pdf
    • https://jewafime.weebly.com/uploads/1/3/2/6/132681773/guziwevapulobut_ritolupov_bavagaboxir.pdf
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/cbd4a21b5d.pdf
    • https://pofitefe.weebly.com/uploads/1/3/4/6/134617546/xijetuparulugi-takezagavi-fobisuvisagox-xuramo.pdf
    • https://zufufikivu.weebly.com/uploads/1/3/1/6/131637839/mibosenozesovi.pdf
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/wenixozonet.pdf
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/lebamol-wevepa.pdf
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/penimelo.pdf
    • https://tufutitos.weebly.com/uploads/1/3/4/4/134491926/jofebaminolajup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/765f1e6f-10dd-4278-80af-01e2dd663cb9/kidosamisonapipobarum.pdf
    • https://uploads.strikinglycdn.com/files/961db27f-03e7-4ad6-84cd-a347dae8d228/wakejabosebabovakezigodil.pdf
    • https://uploads.strikinglycdn.com/files/f83110b9-44c8-4952-b5a3-6d1a45be2089/38558076301.pdf
    • https://uploads.strikinglycdn.com/files/086c6d49-9af1-45c7-bc14-aa9b08ab670d/glow_worm_boiler_manual.pdf
    • https://uploads.strikinglycdn.com/files/81776885-8ff5-4451-817d-b3d1f9951217/firotapo.pdf
    • https://uploads.strikinglycdn.com/files/7460d49b-5b6d-4da2-af78-03b26c7e3bbc/matogugogisumebaj.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_off0000cde3.bin
32cc812f8636333f5969de3fdae2ea5475c254611b5596cdebe197218f4b693d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 5252 bytes
font_01_sfnt_off0000dfd2.bin
323c0770cfd10c42331d8f3f9c18b11c3481f734968adafdb1a5fb38f95add93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 10468 bytes
font_02_sfnt_off00010354.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 4324 bytes

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