Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf848fb51f2e6139…

MALICIOUS

PDF

72.8 KB Created: 2021-01-06 22:06:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7d875dbe38fae8973b624d7317c4f7a3 SHA-1: f633bbef49c6623a4b89aa4ae3cb1a1e06485558 SHA-256: bf848fb51f2e61393145a864229e2dd248c23fad8d58547d530303beec05e4ee
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The embedded URLs are likely used to distribute further malicious content or lead to phishing pages.

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://trafficel.ru/aws?utm_term=ielts+speaking+pdf+2019+makkar PDF link annotation
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/59f7ffd14c372db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417988/normal_5fdbd153e9341.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/3579645.pdfIn PDF document text
    • https://somuwozav.weebly.com/uploads/1/3/4/5/134525430/7e4fb3.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/pudonikiduxari.pdfIn PDF document text
    • https://dabikosetizoje.weebly.com/uploads/1/3/4/2/134234987/lamipesa-naziwobubireke-matapimujaf-gefapamowaze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_5f8a73660b20a.pdfIn PDF document text
    • https://nuguridafames.weebly.com/uploads/1/3/4/6/134650763/kagukukikixip.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/jeUjahd/big_bang_theory_whip_sound.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418575/normal_5fab0283bd3fa.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/8ef73e4498.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/gdyMlrJ/hex_commander_fantasy_heroes.pdfIn PDF document text
    • https://dunefofitibo.weebly.com/uploads/1/3/4/6/134608320/jijufamepojirujaro.pdfIn PDF document text
    • https://feveronibamuja.weebly.com/uploads/1/3/5/3/135300243/bowivuriguti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_5f8bf01702560.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/4bf63a21-0f5e-4f5a-a7e5-820acb9825f5/31428955911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f6bbf5-ff7b-484b-af13-e7212340c998/75687363302.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 5844 bytes
SHA-256: d7f71f3628f3a89a84a01c2a19933aa6942ddc89e6013e48ec7c21284c7a17a3
font_01_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 10948 bytes
SHA-256: 1af14543be58e8aeca205086d36a8e17ffe8e3c5c7af8d1997c8e218063c2bea

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