Malicious PDF — malware analysis report

Static analysis result for SHA-256 5514fe4003df8cfd…

MALICIOUS

PDF

75.7 KB Created: 2021-03-14 01:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2dd54b0b5750d4e89b36699ecbae501c SHA-1: daf58cf0150d8799f846d294353bd875b25225c1 SHA-256: 5514fe4003df8cfdd5404351ef59d588eceb4a6a1aa9b0f7d18a2aa019ee48cf
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-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://kuzutuzo.ru/wix?keyword=dr+web+apk+4pda PDF link annotation
    • https://rukegimamu.weebly.com/uploads/1/3/3/9/133986924/6880997.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/97cc8e.pdfIn PDF document text
    • https://gamidilagadam.weebly.com/uploads/1/3/4/3/134339960/wavafo.pdfIn PDF document text
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/7e013585cef.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/xupiwuzisuligewovomuvuwam.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/44d68f4d-3afb-454c-b87e-5bf62915ac42/17855636756.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/22559700189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1426c04-7db3-43ae-9c53-089571b22c4c/xisisekokolek.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/pobexagoditupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a4c743-f630-45ea-b530-b6ff2c663b8d/air_force_1_custom_designs_womens.pdfIn PDF document text
    • http://xolevusafo.myartsonline.com/14448265895.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/free_modern_certificate_template_psd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c36d0bc-a14b-4cee-b0d3-0810d1b1fd23/64837866971.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_6bfad2380dc44fef9512dcbeac7cc657.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_c11a350e1b3443b6a9532777aa0dc3e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/91994689220.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/plague_inc_prion_brutal_guide.pdfIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_628b2a4639424720965c676d8f8740a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85bfecb8-2ff8-4c72-b3cb-68b3b6707579/englander_pellet_stove_factory_reset.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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 5128 bytes
SHA-256: b34fc2cebdd2d1bc419c390ea4efac7f1f474943070b4f5accb519657f419403
font_01_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 15844 bytes
SHA-256: 4c5b11b13a22fda73b6d979daf482a79668dbf52e658f2f3504c4773bd7bd725

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