Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9cf90c5a3832a2…

MALICIOUS

PDF

73.7 KB Created: 2021-04-06 10:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f5b70c64e29288b8c3ad77e50a9e2522 SHA-1: 747298b39842477cc428adda5fae3832aedba08f SHA-256: bd9cf90c5a3832a2edfd41c3c9b9a2188a460b53daf571e4a1e181564b1d7a4f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xezojetit.ru/wix?keyword=basic+economic+concepts+crossword+puzzle+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5fc666c44a068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404990/normal_60361df2d094c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418993/normal_60088e8b0a26c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484359/normal_600dec84e1627.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/aijg2ib/40563042724.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/KibNc4f/read_musical_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_603919f0357c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446646/normal_60325fb71bf7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405662/normal_5fce408a48155.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_37062232ece24b4c8e8eacc40cd44e6e.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_3b16fd64762743e8a8a0cebebeaee925.pdf?index=trueIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_8c256ac982cc439e94718e02cc3bcfdc.pdf?index=trueIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_139e1411f548458fa762f31dace328e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gusule/99343017734.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/21030031018.pdfIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_15bb8eafa16f4bb085acd790e6a3a267.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_8e4d741d76b946afa4016234f4db8194.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_f34b055a6d174d99b769fad3b9f83a8e.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_8b3d07e4a10943c990649287d4a848e3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 5412 bytes
SHA-256: a48f9f5ed273d8371ffe0977d82172ffa020b267558c86357024b9d2da529f69
font_01_sfnt_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 10504 bytes
SHA-256: b4f0566a2f22bbb4251eeee46cc86631adba832300dfd966147d62364e2e5d92

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