Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac591d85a5795186…

MALICIOUS

PDF

68.2 KB Created: 2021-01-09 15:06:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 281cc50bd3ddeeb2a151c3017d479d43 SHA-1: 7f78112ba1a1c2bc5c8704106e26b7dcfa785199 SHA-256: ac591d85a5795186d58570a9e8216ecda3cdd5302233c8483ededf71e14bcc7a
186 Risk Score

Malware Insights

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

The sample is a PDF that contains a large number of external links, many of which point to other PDFs hosted on disposable domains. This behavior is indicative of a link farm designed to manipulate search engine results or to lure users into clicking on potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=brother+hl-4150cdn+manual PDF link annotation
    • https://cdn.sqhk.co/fovulifavu/gcHhcPX/amazon_used_women_s_golf_clubs.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/kajumukutere-kakenoxaxa-pororetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_5fa4110536152.pdfIn PDF document text
    • https://gunobodupisar.weebly.com/uploads/1/3/4/6/134677737/593942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5f8bba3e65daa.pdfIn PDF document text
    • https://tewagolefavir.weebly.com/uploads/1/3/0/8/130814187/6a46b1fa0.pdfIn PDF document text
    • https://fepaxumezo.weebly.com/uploads/1/3/4/3/134320712/rigefimasav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480149/normal_5fe1a64ac2262.pdfIn PDF document text
    • https://kunepupavebi.weebly.com/uploads/1/3/4/0/134095879/5ee048eefb.pdfIn PDF document text
    • https://cdn.sqhk.co/rojisixel/gj3uhgS/turbo_stars_hack_app.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/581eb396-62cf-4ce9-bafe-a92c95ee269c/9359678664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abdfb728-dead-41d2-a416-3725dc7c8664/dabikevojamolipapiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f690946-ae26-4b88-a15e-587c5e81b666/morgan_images_of_organisation.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_off0000ccb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB2 5488 bytes
SHA-256: 9560ff8be7c1528a0bb00d695df8fd3fb89ea5013415596b80df9cc0154e6bad
font_01_sfnt_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 10680 bytes
SHA-256: b32fc78fd157af7f6a901f102f1b191a98eaa08f4fa9203e2ed79dc6222f8dd8

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