Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43c5ab240806837…

MALICIOUS

PDF

76.0 KB Created: 2021-04-14 19:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3ce3dc2f9a7bf34ff29b1cfe79faf6f1 SHA-1: 5072ca1e122342d27ae9fcf055e35b1e5547017b SHA-256: d43c5ab240806837bfac72712ef6f8b884126afcdd87749fc10967a9833d04e1
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 0.9999

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://lozipotod.ru/strik?utm_term=is+roborock+s5+max+worth+it PDF link annotation
    • https://cdn.sqhk.co/tamoravuwera/OjbHgjO/vijigatir.pdfIn PDF document text
    • http://lanejaselisipu.22web.org/focused_acceptance_and_commitment_therapy.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/jfggNhb/suruxozixagejelujel.pdfIn PDF document text
    • http://fifixerabola.iblogger.org/jagitunatugifaxure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_7546617895dc458db285c3444db41e99.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/django_template_tags_boolean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/562477c3-9168-42ee-95b9-0db33a93f1d6/richboytroy_net_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/cantharidin_molluscum.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/evidence_of_things_unseen.pdfIn PDF document text
    • http://wunorewotiv.epizy.com/64306431727.pdfIn PDF document text
    • http://zarusorujot.epizy.com/stock_market_real_time_graph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f0e0cf8-be4e-49cd-b76e-55443e88be59/vajawawadepudi.pdfIn PDF document text
    • http://wemopax.rf.gd/who_built_angkor_wat_and_why.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f1e9f70-b2ce-4c81-92b2-1c973ebae157/terifagazaneborizowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2526b09-fad2-4c92-82e1-045acc98fa01/html_tutorial_pptx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e53f4d1-4cd8-4e0a-b829-03388326993a/french_reflexive_verbs_worksheet_tes.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_b53c6528463345acaabc9ae8f91856f2.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 5432 bytes
SHA-256: f0fb3aed1765ffa1248d8a2a1954e9c0ffe04156c02404d256455c5ca9daf757
font_01_sfnt_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 10840 bytes
SHA-256: c959b6535710b87a8df2bba587a059e7891cd1b8e53b98037ba5251624996e7d

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