Malicious PDF — malware analysis report

Static analysis result for SHA-256 4460608c9f2d94c4…

MALICIOUS

PDF

82.0 KB Created: 2021-04-02 06:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70306372166714813fecbd90b2bd91f2 SHA-1: 27510e551f58aea2f76de83c8c195d01a152bcf7 SHA-256: 4460608c9f2d94c48a73662f4444197d34be44a96cf30b4c2141fa600bf6d0b2
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to technical queries, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://mezovuduw.ru/aws?utm_term=toughest+sql+queries+interview+questions
    • http://rolopigabetitu.scienceontheweb.net/how_to_use_multimeter_free_download.pdf
    • http://santand-es.com/mitosis_worksheet_biology_answer_keyby6y3.pdf
    • http://medyayazilimtr.com/kulomumutikozodavatufigpv79f.pdf
    • http://rivugijunamusi.mygamesonline.org/gezojubado.pdf
    • http://kigirifaduguv.getenjoyment.net/54788576056.pdf
    • http://epipog.com/58771319247mvebe.pdf
    • https://cdn.sqhk.co/tubadaluzafu/gccfigO/dino_t-_rex_hack_apk.pdf
    • http://forexgeeks.net/63663760165n0w0u.pdf
    • https://cdn.sqhk.co/kivipemo/igjogi7/nixotaxap.pdf
    • https://cdn.sqhk.co/jotapepikota/bwjy1gj/today_s_date_in_excel_sheet.pdf
    • http://mignonette.space/how_to_know_if_molecular_geometry_is_bent77q3v.pdf
    • http://gavediteriremuv.medianewsonline.com/17141921986.pdf
    • https://cdn.sqhk.co/sadetujadufi/hj1jhwo/70994356175.pdf
    • http://jofufunobek.sportsontheweb.net/riligax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fedure/33388425817.pdf
    • http://nimezidudixo.epizy.com/how_fast_is_a_polaris_trail_boss_330.pdf
    • https://s3.amazonaws.com/tezofuretejom/57540832077.pdf
    • https://s3.amazonaws.com/lorugipopuxe/66360170128.pdf
    • http://daduzafez.epizy.com/xopifarupipejafif.pdf
    • https://s3.amazonaws.com/luxelula/hollywood_reporter_directors_roundtable_2014.pdf
    • https://s3.amazonaws.com/bezorito/wofepotelekaw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010441.bin
4301384bcc2bb82fd9de20575a549be5d36619b121dfa604fe2ec602a290b73a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 4964 bytes
font_01_sfnt_off00011537.bin
266b89bdfca02c1992cb4b71c4134901ce798aa85261ec76069512734e195a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 11052 bytes

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