Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3363499e023ad5…

MALICIOUS

PDF

76.8 KB Created: 2021-06-02 13:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b8188e1da9b62f0b27dba93cb5dd9d41 SHA-1: 4b4033f1e1fc3cc62d0965a5d229c1a0e50a9791 SHA-256: 4a3363499e023ad51d6933e083228c6df36cd1174cf8ce5b3e45fb56933c3a46
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, indicative of a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting a high number of links on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://catamma.ru/pbw?utm_term=reaccion+de+lugol+para+carbohidratos PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4407057/normal_60affa177383b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494893/normal_601bb88141568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392868/normal_6041e5756ffda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_603ebdb2712cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zekodunu.pbworks.com/f/how_to_make_crosley_record_player_work.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/w/file/fetch/144426939/73696835207.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144498801/19607159355.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/sepujoxedazaferurituwogov.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/w/file/fetch/144420996/siwin.pdfIn PDF document text
    • http://nowefuro.pbworks.com/w/file/fetch/144422457/18841513768.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/79475037632.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/lijedaxelev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c74268c8-ee01-4287-a21a-20cd34317467/42282671256.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/33807703083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4175ebd0-63a4-4ac0-97c8-3ba592ab3fbe/21345131062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a30b704a-5abb-4d79-9d69-3c3b5304c721/analyzing_baseball_data_with_r_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8a4e34-27a5-49c6-8961-96ef3ed0e131/what_are_three_bodies_of_water_in_canada.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/wixeduputifodupiteli.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/f/probability_and_statistics_for_engineers.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/33039224375.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/f/what_are_ten_commandments_in_order.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_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 5484 bytes
SHA-256: 45313567b320b7ab72a3d5723e3c48567ba3817f984847726b00bc42f550d497
font_01_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 11536 bytes
SHA-256: 47b1df6de70ee7156f3f63fc2ba75a8adc88c35cc46be56890aeaefb17f54de0

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