Malicious PDF — malware analysis report

Static analysis result for SHA-256 608cca38d0d2bf35…

MALICIOUS

PDF

68.1 KB Created: 2021-03-14 03:37:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8f1e5c5e258a3349cc00ade054bd3d4d SHA-1: d10c5b9647885e30435e29afe5caab48e9d75683 SHA-256: 608cca38d0d2bf35e8e0a11b1c691a855955779bea5e634d541fd78d2c40f349
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is classified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

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://pelibifir.ru/strik?utm_term=this+is+amazing+grace+bethel+lyrics PDF link annotation
    • http://bestcreditcheck.info/spotify_premium_apk_cracked_offline8fy6f.pdfIn PDF document text
    • http://fesunasisodenod.getenjoyment.net/zikukeronogabagoxofiledum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393204/normal_5fc988d06ecca.pdfIn PDF document text
    • https://zaxefuki.weebly.com/uploads/1/3/5/2/135299090/395d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407749/normal_600729d1408a9.pdfIn PDF document text
    • http://vienvozvrat.site/91997839139fzgis.pdfIn PDF document text
    • http://accueilcmb.com/58863486809mqafe.pdfIn PDF document text
    • http://mscredit.info/gangster_squad_movie_freewo25o.pdfIn PDF document text
    • http://phtech.site/nupanupirevaze9k2tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_601f0b95c7455.pdfIn PDF document text
    • http://bizowokare.getenjoyment.net/fefobitedizavuxi.pdfIn PDF document text
    • https://ruvawigalovenu.weebly.com/uploads/1/3/4/3/134318686/9734846.pdfIn PDF document text
    • http://pe50off.info/51718196109tu2hi.pdfIn PDF document text
    • http://freehookup.xyz/one_syllable_words_that_begin_with_mtmx5r.pdfIn PDF document text
    • http://edevletorg.com/sifomulunetovmsa4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_2d9e3bb0bcbe421bacfec0ddce6850c6.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_3478418a7c46482694eff5b47b8e8194.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_off0000ce94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE94 5452 bytes
SHA-256: 5a546ccd58a5dc38ab82c3779e454f035cdb632bf28a2bc88c485ea4547afbe0
font_01_sfnt_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 10008 bytes
SHA-256: 775796a7266d3c44557775d56c18aa0c9a6996dc54609b0c1484bc097596c16a

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