Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc210b92d803237…

MALICIOUS

PDF

78.2 KB Created: 2021-03-08 16:39:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: b11e632905afe3ad7ad024f88377750e SHA-1: 41d00b6248108315d51cfd72e2ba43af53d57089 SHA-256: 0cc210b92d8032370a2282b202dbaafc13a5a07cb9f5584e8cfedd84e0f40b2d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDF files hosted on various domains, some of which appear to be disposable. This technique is often used for SEO manipulation or to distribute further malicious content. The presence of multiple external links and the ML detection strongly suggest this file is part of a larger malicious operation.

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://leonvi.ru/aws?utm_term=panasonic+dmr-es46v+remote PDF link annotation
    • https://cdn.sqhk.co/xozifejor/geYgjgh/neraxinufegibep.pdfIn PDF document text
    • http://beritox.medianewsonline.com/oster_bread_machine_parts_model_5838.pdfIn PDF document text
    • https://cdn.sqhk.co/dokederajo/Njd1ggR/redigusugagegefavuvosizu.pdfIn PDF document text
    • https://cdn.sqhk.co/kapapomabu/mFjidgf/agl_energy_share_price_graph.pdfIn PDF document text
    • http://procripton.com/ancient_greece_map_labeled_cities18gcr.pdfIn PDF document text
    • http://trikolor.site/mountaineering_terms_and_definitions5uhr0.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/g5haAgd/79367797882.pdfIn PDF document text
    • http://ewop.space/download_gta_vc_liteyk407.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/43192779884.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/trimble_business_center_hce_4.10_download.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/are_alesis_drums_any_good.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_8b1cdc8bcef94c23a7eb61d6ec0fab76.pdf?index=trueIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_266e727ab1bf4e44919eb3dd8907ad29.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_8bb75b2cd68e4865af3c585df136e84f.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_94aa311b8d864b58b83803341faf091e.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_fc409e7b14ae4cf8b28d34a640572343.pdf?index=trueIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_98d46fe81f9a402d824da8a62e089131.pdf?index=trueIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_968eee7012554ec798496f6ab653c742.pdf?index=trueIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_a129909ed47d4061aa052cb6c8df998d.pdf?index=trueIn 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_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 5176 bytes
SHA-256: 2b4a21b3e72af615335b6bd6dd6244fc28063e51877004b253b6181a799c4842
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 11112 bytes
SHA-256: 46dae3cdf5c51a957b4e5a5b4bc88263ced945f391b3415ff909719ac6598feb
font_02_sfnt_off00011d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D74 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230