Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9716cd6551b24e…

MALICIOUS

PDF

74.8 KB Created: 2021-04-05 22:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb49c261e452eb26c94d6ec48de44841 SHA-1: d96b8b183a4b1e9902f2a6a4932ab4a8ba2f2722 SHA-256: 0a9716cd6551b24e9839fb55b5b1de44c369e7ea7e39e8b76689f86a7af7f10b
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a "PDF_SEO_LINK_FARM" and "PDF_SEO_DISPOSABLE_LINK_FARM" heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as "Pdf.Phishing.Trojan". The embedded URLs suggest a phishing or SEO spam campaign, aiming to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://bologen.ru/123?utm_term=black+background+image
    • https://xakebugus.weebly.com/uploads/1/3/4/0/134018628/5d8d1a398b6.pdf
    • http://profit-makers.club/66072447310fkpby.pdf
    • https://werudugin.weebly.com/uploads/1/3/0/8/130873895/3521737.pdf
    • https://sukivafuxek.weebly.com/uploads/1/3/0/8/130874221/bolaketet.pdf
    • http://pusuwanoxanopo.22web.org/bach_musical_offering.pdf
    • https://nipixejewawowe.weebly.com/uploads/1/3/0/8/130874539/vifojexogi_gajijegab.pdf
    • https://cdn-cms.f-static.net/uploads/4377706/normal_602af44558252.pdf
    • http://greatmasters.biz/trek_incite_8i_manual2zinf.pdf
    • https://cdn-cms.f-static.net/uploads/4418369/normal_606abc7e13828.pdf
    • http://businesshelpservice.com/how_to_build_muscle_at_home_without_equipment_redditf6mmw.pdf
    • https://kabawerabava.weebly.com/uploads/1/3/0/7/130774965/3111772.pdf
    • http://zuferiwabofeg.22web.org/lizanarub.pdf
    • https://cdn-cms.f-static.net/uploads/4479470/normal_5fdb759bb12ce.pdf
    • https://bejitukinerebi.weebly.com/uploads/1/3/4/8/134890105/f6c95e631433b22.pdf
    • https://cdn-cms.f-static.net/uploads/4461211/normal_602d4f10c6d6a.pdf
    • https://kapupidaxor.weebly.com/uploads/1/3/5/3/135386814/4356830.pdf
    • https://wulaludotesi.weebly.com/uploads/1/3/0/9/130969185/8b8e0771.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0b40c160-44ba-44e2-bb8b-46f2c273be45/film_the_bfg_2016_full_movie.pdf
    • https://uploads.strikinglycdn.com/files/b7cb54e5-6488-4bf8-bb81-16793c2e9505/ypfb_instalacin_de_gas_domiciliario_requisitos.pdf
    • https://uploads.strikinglycdn.com/files/84cb049c-d8c7-4d1c-8112-9b792468efda/tereregumerinuzemakejora.pdf
    • http://zezatavaveb.epizy.com/chemquest_19_ionic_bonding_answer_key.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_off0000e7c8.bin
1a38c306440565534527ce111e9024dfe5fb5ee1795ecba7f4bd81ef571f0fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 5332 bytes
font_01_sfnt_off0000f9d2.bin
76adc00acd516e0b2335da4c6358c52ec1df043417cdb9cda6d8954988b4b03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 10912 bytes

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