Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c19b1994a31b0ae…

MALICIOUS

PDF

70.9 KB Created: 2021-03-04 01:26:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4a60921b53f050cb3349ea81ed9ca36c SHA-1: ee9735ad24cef494cb18d0dda97418deb346c6cd SHA-256: 0c19b1994a31b0aec5fbb1f48f02ec2b8fa2dac5bb51b44e67b9ec1184fe6323
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with at least one (`https://xezojetit.ru/award?keyword=roland+barthes+semiotics+theory+media`) being directly linked to the PDF's content and potentially serving as a lure. The PDF structure also indicates it's a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of multiple external links suggests the PDF's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/award?keyword=roland+barthes+semiotics+theory+media PDF link annotation
    • http://jotitojimo.mygamesonline.org/how_to_turn_on_an_ipod_shuffle_2nd_generation.pdfIn PDF document text
    • http://nosixavol.sportsontheweb.net/economics_for_dummies_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491155/normal_6035b46092ba6.pdfIn PDF document text
    • https://lekofubazag.weebly.com/uploads/1/3/1/8/131872104/nebakumuki_fidujodew_tarataxe.pdfIn PDF document text
    • https://wabibazo.weebly.com/uploads/1/3/5/2/135295983/6719327.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/gf6bFii/tubup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_601fcf27ee7a5.pdfIn PDF document text
    • http://dipazekonowa.mypressonline.com/42172725543.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_600395a63a799.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/ti_84_plus_ce_pokemon_red_rom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/tejuzogezeza.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/11690417097.pdfIn PDF document text
    • http://mujebik.atwebpages.com/mekibusajologapafoli.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/nepejabusitenani.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/icao_annex_17_free.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_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 5428 bytes
SHA-256: 2d04feb516b7a206001df09931379644e50ad9bb035cbee752127c8ce85025af
font_01_sfnt_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 10128 bytes
SHA-256: 05ab24636ac719ccaabff5b67a624425659081e240212809cbc206cb14590d46

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