Malicious PDF — malware analysis report

Static analysis result for SHA-256 4caefa4c748165f2…

MALICIOUS

PDF

76.3 KB Created: 2021-04-04 23:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 206ab679b4536733e53b4449926b8212 SHA-1: 21aa14ce853ff59d9dbbbbf67d69dcf0854b3bc5 SHA-256: 4caefa4c748165f27c6ed724c16f67eba0ebfc79505584308b1fcc69fcb85130
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=how+to+day+trade+for+beginners+pdf PDF link annotation
    • http://lomigakorak.getenjoyment.net/simple_past_irregular_verbs_affirmative_negative_interrogative_exercises.pdfIn PDF document text
    • https://mipixapotorifa.weebly.com/uploads/1/3/0/9/130969355/5732241.pdfIn PDF document text
    • http://tuwimig.scienceontheweb.net/23277739530.pdfIn PDF document text
    • https://wedemewimobuxet.weebly.com/uploads/1/3/4/3/134309086/wakes.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/8094108992.pdfIn PDF document text
    • https://kibutabez.weebly.com/uploads/1/3/4/4/134438896/20096c90d.pdfIn PDF document text
    • http://saduzemed.mypressonline.com/southwest_airlines_logo.pdfIn PDF document text
    • http://kojanusipesipe.scienceontheweb.net/callan_method_stage_2_chomikuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_e1da326f59da4806aaab592bec772001.pdf?index=trueIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_c25a8250d3c3412b80adeb964bf4a7f4.pdf?index=trueIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_53f1db5f3c004687b6e2c9c679cb9661.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/voban.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_bce470f9580c476c8e51b8fe9f7b9440.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/can_u_take_a_nap_in_contact_lenses.pdfIn PDF document text
    • https://0a3880f2-9bda-4900-b484-73a003b8a878.filesusr.com/ugd/3cbe5d_8b7b734c6dd94596a9b17e75b64840d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xubifupi/zimelemuli.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/worm_dissection_worksheet_answers.pdfIn PDF document text
    • https://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_a99357e5473843dda9633c2e975f278f.pdf?index=trueIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_13a3c7c1838048a79b52f4f77541dbda.pdf?index=trueIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_7b2068eede704b5bb4d8a349fcaa67ad.pdf?index=trueIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_20426a39422f46b986652ab1b156708c.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_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 5472 bytes
SHA-256: fa1a44a7944523763e381598be51c8331a5a6fb3970112db620862eb281ec556
font_01_sfnt_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 11072 bytes
SHA-256: 73c2a62fac2fd83702151dfc3841dabedd6cb292e4946630a6c7ed99a560271c