Malicious PDF — malware analysis report

Static analysis result for SHA-256 94db7bc4f624c4f4…

MALICIOUS

PDF

76.5 KB Created: 2021-03-12 21:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6795c1d65acc447844cfeac801872897 SHA-1: a21f2b5cada881956170fc9d97e999c7e483964e SHA-256: 94db7bc4f624c4f41729664c95f8d9649e775fc7080db1c62f2701a7436b9689
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-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://dafemum.ru/123?utm_term=the+hollywood+reporter+roundtable+podcast
    • https://cdn.sqhk.co/nafadurip/y7diiie/shadow_death_stickman_fight_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4458137/normal_5fed4b96a8da8.pdf
    • https://static.s123-cdn-static.com/uploads/4423154/normal_5fcc2e4ae45ef.pdf
    • https://cdn.sqhk.co/suvotoruwot/AieidXe/patanjali_yoga_sutra_book_in_english.pdf
    • https://static.s123-cdn-static.com/uploads/4383464/normal_5ff35f6917be3.pdf
    • https://cdn.sqhk.co/gufemazibafi/ifjPZic/stick_warriors_shadow_of_legends_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4453553/normal_6016c128e95c5.pdf
    • https://cdn-cms.f-static.net/uploads/4458827/normal_601f5efa7cbca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_eb4a549e248d48b9bc5a4cb9b651bf15.pdf?index=true
    • https://s3.amazonaws.com/zopenave/free_residential_lease_agreement_form.pdf
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_dbbc180985cc4c4b8d191becab8e2cee.pdf?index=true
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_ed956b9fe95c4fa1951ec9b81b497dec.pdf?index=true
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_7a59d853b905477eb8ef0246e0ced584.pdf?index=true
    • https://s3.amazonaws.com/fomudebipefasu/20488348550.pdf
    • https://be8f41f0-9ddd-434d-ab6d-aa755a40b80d.filesusr.com/ugd/726d9c_a6f35653697d45d7beaadbdc98c082ba.pdf?index=true
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_8044ce0c92594cb180c60fa70246ea4c.pdf?index=true
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_91c7ec59c3954a07a70898ab45968aff.pdf?index=true
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_a89c0692929949a8852425f8449735e7.pdf?index=true
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_baf8e063af0448dba472415c251b1bd7.pdf?index=true
    • https://s3.amazonaws.com/jazuravazaguz/79343757596.pdf
    • http://tikijot.epizy.com/baghban_full_movie_in_720p.pdf
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_951384c7f54e4d1e8fe12e5d65948217.pdf?index=true
    • http://xexelakufakeze.epizy.com/fufomip.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_off0000ed3b.bin
64a6bd7a0319af76d39cf03a94b6390ccb8c00c91e6d0a9d1aef95ff059c79cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 5444 bytes
font_01_sfnt_off0000ffc4.bin
09f481ca87eb88dea39c14044e3c593ed549d9792d4e732c9b0cb4c4f751b2e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 10816 bytes

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