Malicious PDF — malware analysis report

Static analysis result for SHA-256 6117ed371d2f39ee…

MALICIOUS

PDF

77.4 KB Created: 2021-06-03 00:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8da63736fa7f77e34becd618d80fc807 SHA-1: 22e7372f22f612814156047c467e9a0441582237 SHA-256: 6117ed371d2f39ee540b88749eddac1276bf1be17b3cdf2203172b6773c3f7fe
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to a '2010 nissan armada platinum manual' and 'wkhtmltopdf', likely a lure to disguise the malicious intent of directing users to external sites.

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://vilenefex.ru/123?utm_term=2010+nissan+armada+platinum+manual
    • https://narimokilef.weebly.com/uploads/1/3/4/6/134603618/a3f97.pdf
    • https://static.s123-cdn-static.com/uploads/4481509/normal_5fecc278bc1a7.pdf
    • https://cdn-cms.f-static.net/uploads/4409123/normal_602c285f3a7dc.pdf
    • https://cdn-cms.f-static.net/uploads/4408177/normal_606a09c8edfde.pdf
    • https://cdn-cms.f-static.net/uploads/4501794/normal_605f98c33eed5.pdf
    • https://jozinuzo.weebly.com/uploads/1/3/2/7/132712000/jovuvonew_pimep.pdf
    • https://cdn-cms.f-static.net/uploads/4465270/normal_605011b62666a.pdf
    • https://romasagato.weebly.com/uploads/1/3/4/7/134723475/roxinefirumibenarur.pdf
    • https://cdn-cms.f-static.net/uploads/4411681/normal_6059ab83b6cf6.pdf
    • https://tomadukego.weebly.com/uploads/1/3/6/0/136083679/xokibibif.pdf
    • https://xekigumi.weebly.com/uploads/1/3/0/7/130776031/6523087.pdf
    • https://gupoxebexu.weebly.com/uploads/1/3/4/3/134337811/4245405.pdf
    • https://luxefelukij.weebly.com/uploads/1/3/0/7/130775337/224cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lagawiwefe.pbworks.com/f/what_is_the_message_of_the_chronicles_of_narnia.pdf
    • https://uploads.strikinglycdn.com/files/84a7c59e-30ad-40af-99ef-b21e2f75a294/kenwood_heater_timer_instructions.pdf
    • http://foxobekizax.pbworks.com/w/file/fetch/144452286/kuvozog.pdf
    • https://uploads.strikinglycdn.com/files/1b0692ba-72d7-4cd8-8df7-910d863de38b/what_are_the_key_features_of_travel_writing.pdf
    • https://uploads.strikinglycdn.com/files/8046ddfc-45d6-45ab-a708-b4d90aea235e/prince_joseph_wenzel_of_liechtenstein_net_worth.pdf
    • https://uploads.strikinglycdn.com/files/9c21fbc2-eb12-4289-8539-91c2f6964121/cual_es_el_campo_de_estudio_de_la_psicologia_industrial.pdf
    • https://uploads.strikinglycdn.com/files/f6b14539-ca21-499c-a22c-e6d9dba56a75/wowurezoditifewuv.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_off0000f00d.bin
4015afe4f3e68b1c953e2670c365f8ea5433163d30075bd3ea0608587d8aae57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 5336 bytes
font_01_sfnt_off0001021b.bin
194571ee46e15fd756c605ebfbc0823dbb5f91f37da7d672d15a327f794199c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 10608 bytes

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