Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc5bb065f7e8ce8…

MALICIOUS

PDF

79.1 KB Created: 2021-03-22 19:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a7ffdf6dce8c1557e2f3bec17df79913 SHA-1: 37b5fa8b9d017a67518c6e6f3cff266327c667d7 SHA-256: dbc5bb065f7e8ce82323ebdaeb64b029007f0440a5ba580e64de7b09c3142f46
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including those on disposable hosting, suggests an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to PDF creation and keywords that could be used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=bauordnung+bayern+pdf PDF link annotation
    • https://cdn.sqhk.co/fovipobex/c8tZ7Rc/hachi_movie_japanese.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/pdf_splitter_and_merger_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_6037014d38f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_5fd82e4c24eb1.pdfIn PDF document text
    • http://lopixerirerenex.mywebcommunity.org/azolla_filiculoides.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_6041a1c11ae6a.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/iege9if/85877259032.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413374/normal_5feafcb02e5e2.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/acidihH/84906351323.pdfIn PDF document text
    • http://jevuzedozuk.iblogger.org/jijeroxukuronazufepes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_60432e76e4082.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369174/normal_6006a44c0ac32.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/Ejdhhgc/28218420068.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484805/normal_5ffc352b83a39.pdfIn PDF document text
    • https://cdn.sqhk.co/figoveraboj/OihjcJs/2_player_car_racing_games_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/9heOqMg/64233836754.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/jfXRggD/53263693346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fegozijagomon.rf.gd/wogebiwewofuparusag.pdfIn PDF document text
    • http://luxupovokajaf.onlinewebshop.net/mijil.pdfIn PDF document text
    • http://pewejexuti.rf.gd/zigodasizuliw.pdfIn PDF document text
    • http://gepivefukusi.atwebpages.com/pebobasusomezafedax.pdfIn PDF document text
    • http://sarutufasiko.atwebpages.com/frozen_shoulder_treatment_exercise.pdfIn PDF document text
    • http://pasufok.rf.gd/48556411310.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 5292 bytes
SHA-256: 733af67d87f642fe41da35a736b8f691aa95044c2dfb293d1ca3ea9f07babf3a
font_01_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 12340 bytes
SHA-256: c5b91128395ece06b8f0d3c16b1c575ca938db7127da3a646164d408fe21b29a

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