Malicious PDF — malware analysis report

Static analysis result for SHA-256 a739d85d114856b2…

MALICIOUS

PDF

66.2 KB Created: 2021-01-03 12:41:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 57d87c27bba1249e233d0cbf7b269786 SHA-1: f16b5e33e6cf0dcebbdf7b3d92e0a71045181f99 SHA-256: a739d85d114856b2dad023e573c43532b092e8b83ef4919ccd388f26f1f6ae92
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting or known redirector infrastructure, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=mr+ashok+kumar+ringtone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5f9bb3a49f88c.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/4449a6595dc6c.pdfIn PDF document text
    • https://majemuxisirilud.weebly.com/uploads/1/3/4/7/134719568/zamepovarofixid-negupasezojus-zumezuwikonaje-jamifetujunod.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/0d96feb8fa8c3da.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/143632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370080/normal_5f9dbaa7d8665.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/niwik_fukuwupow_dazoxowinaw_xezogawo.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/e687c077-8853-4ffb-ae57-035c5700f3e8/33754046716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad7999dc-55dd-47ff-9892-4ec27a2e21fd/bobs_shanghai_66_rockville_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468b5024-e938-43bb-8452-b4d129dcc53e/vmware_unlocker_mojave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecdb3626-ff8b-4999-8c8a-d0b0654983af/gozovumipexagusufajokodok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed94e93f-cd25-4d4b-ad50-e7281e2a0532/tadarukavojisojok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74499ef6-d30c-433e-ac9f-2bf8053d583a/pusez.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/ripajukowojazesokavu.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_off0000c7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E2 5136 bytes
SHA-256: b3efb2675317de9dedc9156b0ce91935f3a5ff3fdd92316d2dc1602668295201
font_01_sfnt_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 10272 bytes
SHA-256: 3d53b0bf720646ccf4f6daae5938a15ed8c998b98348e6465c4083ee0f21d9a6

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