Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07f10cc30360ea3…

MALICIOUS

PDF

74.3 KB Created: 2021-03-09 04:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4bbd002dbb0a722149459011001c05a SHA-1: b9450e9945a70dd213d809ec12bafc6fefd9d60b SHA-256: f07f10cc30360ea37dcf691a52bc72851b8e1807be8185ad679e1fada694d767
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external URIs, including one pointing to 'leonvi.ru', suggesting it functions as a link farm to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a deliberate attempt to obscure the true malicious destination through a large number of links on disposable hosting.

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://leonvi.ru/award?keyword=bls+latest+guidelines+pdf
    • https://cdn-cms.f-static.net/uploads/4393028/normal_600bb0d2ed91f.pdf
    • http://lomuwugevona.getenjoyment.net/quran_english_malayalam_meaning_audio.pdf
    • https://juxufosuzuvol.weebly.com/uploads/1/3/1/4/131437906/pepopat.pdf
    • https://static.s123-cdn-static.com/uploads/4484399/normal_5ff6202993cfa.pdf
    • https://static.s123-cdn-static.com/uploads/4466379/normal_5fde59a0e9c7d.pdf
    • http://fejukoturig.medianewsonline.com/dapugonetota.pdf
    • http://zigapajuxijado.mywebcommunity.org/adverbs_of_frequency_and_manner_exercises.pdf
    • https://borubuzas.weebly.com/uploads/1/3/4/0/134042729/suwekagozemuxuju.pdf
    • https://cdn.sqhk.co/nexetifosam/oVY27ha/64728887418.pdf
    • https://static.s123-cdn-static.com/uploads/4401985/normal_5fc87c4b2012a.pdf
    • https://cdn.sqhk.co/kegufamop/mjatjjU/lulusibawamexojegaxo.pdf
    • https://cdn-cms.f-static.net/uploads/4489035/normal_6045dcccb1554.pdf
    • https://cdn.sqhk.co/bamikalagov/hgjGhgZ/scared_mouse_running_away.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tivupizo.epizy.com/zezusazivubotifapajosagas.pdf
    • https://uploads.strikinglycdn.com/files/a6e84874-93bb-4e42-a2d6-5b4b15b8e7f8/93702549630.pdf
    • http://zitadufafasid.onlinewebshop.net/vilof.pdf
    • http://bajewilogofiro.epizy.com/3551199748.pdf
    • https://uploads.strikinglycdn.com/files/ea6e44b5-7ab4-4b4d-b29b-7aee5cee4d6e/daycare_employee_handbook_2019.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_off0000e6e9.bin
c48846d5e4d5ecb094f3844bb36140f4a879c2a69a3b481bbc312e6f02f82c23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 5160 bytes
font_01_sfnt_off0000f896.bin
d55cabf718cefc421fc062baf593578ba7c8ed7e340a7907977e7c248a163dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 10308 bytes

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