Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acf90ac05b13142…

MALICIOUS

PDF

93.5 KB Created: 2020-11-17 21:23:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 61a9a8a72066e4ef75e814826809cf8b SHA-1: 1d37e9f70719d5c6a2b3566f2708096495133f1a SHA-256: 0acf90ac05b131426d2c06624fb423161d63a512ac656cf143fed4682fbb7995
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially malicious sites, disguised as a game.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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=super+mario+62+unblocked PDF link annotation
    • https://kitujimozudek.weebly.com/uploads/1/3/4/3/134375735/pevolabox-gegex-wumetexuma-jawuku.pdfIn PDF document text
    • https://monubigikupo.weebly.com/uploads/1/3/4/4/134493781/vuvono-zidug-bikijo.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/tizedeniluxiz-gefowigujotubu-senunomikale.pdfIn PDF document text
    • https://bizalaso.weebly.com/uploads/1/3/4/4/134443832/rajanenew_xurafakurikora_zanimojazi_metikewaxek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_5f961ff4dd2d1.pdfIn PDF document text
    • https://somisesi.weebly.com/uploads/1/3/4/5/134523690/lasojununezikokiga.pdfIn PDF document text
    • https://renalulawe.weebly.com/uploads/1/3/4/7/134735886/lobotuvadoxufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/839d13ee-37ca-42d0-85cd-43a54644450c/rebecca_daphne_du_maurier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed53e1b-d485-4803-a54c-3738a8e5e192/muzomesel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abce5352-2dbf-4363-8286-7be879d6e0f9/fimut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a840d310-f93b-4d49-bb4e-152affc03ca6/symbols_of_the_catholic_church_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1361ca08-17e9-4c28-a236-8e74e9adcc57/tiroxivurigalevasuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96bdeb56-14fd-4b6d-a57b-258576051439/63138192323.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 11732 bytes
SHA-256: 14b29ce0014fd0bf056fc99292d4e9f73ec7f774118f0220488ef11c68da4a8f
font_01_sfnt_off00012e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0A 5632 bytes
SHA-256: 61deb1aa96bce728ed18d6ba1a7b5a304921c4269cc207621cf0c6f5d4ddec93
font_02_sfnt_off0001411c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411C 12196 bytes
SHA-256: b7b71723e8b7215a1bd1e008e2ccbd08ec9b34635c46fb1fdc2fe16b6a1aa1c5

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