Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b7e9f27c228942…

MALICIOUS

PDF

73.0 KB Created: 2021-04-28 21:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 805cb61ee7fd39cdabf73959db014f8f SHA-1: 9f7c5dddc8d87b66b7c04eb97f30cecc58a6655f SHA-256: f8b7e9f27c2289422761e2ec4399a57b44aa62aef77ce53678fe7f0268dd045a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with a prominent one leading to 'jacksth.ru', likely serving as a redirection to a malicious site. The presence of multiple disposable domains and link farms suggests an attempt to obscure the final malicious destination.

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://jacksth.ru/strik?utm_term=how+to+fix+ps4+disc+eject+issue
    • http://sokfresh.fun/zabuwo29nqe.pdf
    • http://sodaapp.club/qsc_touchmix_8_price_in_indiazrobm.pdf
    • https://static.s123-cdn-static.com/uploads/4458132/normal_6008d8d7a5d88.pdf
    • http://flipping-car.online/tropical_rainforest_abiotic_and_biotic_factorsi7gas.pdf
    • https://cdn-cms.f-static.net/uploads/4370746/normal_60698e63ecdb3.pdf
    • https://cdn-cms.f-static.net/uploads/4461525/normal_603ad3cc68779.pdf
    • http://porn77.design/disposiciones_legales_acerca_de_la_obligatoriedad_de_la_contabilidadxr6v7.pdf
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5fd7b2758d112.pdf
    • http://kumorepo.22web.org/besasuwegox.pdf
    • https://static.s123-cdn-static.com/uploads/4530036/normal_5ff5fac436bc2.pdf
    • https://cdn-cms.f-static.net/uploads/4374963/normal_606c8c1a8eb31.pdf
    • http://table-wait.com/850362298869rvr2.pdf
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5ff7a0f3a155c.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pozadel.epizy.com/treasure_hunter_metal_detector_manual.pdf
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_a5988fa5d20940458d395c8476e3de0d.pdf?index=true
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_f26828ffedbb4e20b3f5e400e6644f84.pdf?index=true
    • 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_off0000e1a2.bin
d151d0d03db8923d8df4c7edaa0d92974b279f54d51f1848784c95bf3cca1bc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 5096 bytes
font_01_sfnt_off0000f337.bin
4c65c3e63d0d8d0eee5f0701c2a0b7438a1d607cafb6e09e43e326130b98657f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 10556 bytes

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