Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb19901b18664f9…

MALICIOUS

PDF

85.4 KB Created: 2021-03-18 12:04:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ac3c23c7e1164b08d91e44ad0ec3825 SHA-1: d9ea6b1582b8353fb71f78d0a5f6d3e63e883359 SHA-256: 8eb19901b18664f9ea3ab6b362a9c358a0298ec27ecf6fdf9f64bdb5c60f7c2a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://golowaki.ru/123?utm_term=basic+russian+words+and+phrases+pdf
    • http://rineset.xyz/33170800394zw6gk.pdf
    • https://cdn.sqhk.co/nejibija/ijQNidI/bazotimekafutonud.pdf
    • http://telovajov.medianewsonline.com/holt_mcdougal_algebra_1_download.pdf
    • https://livekurot.weebly.com/uploads/1/3/4/4/134443702/9938163.pdf
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/8260610.pdf
    • https://cdn.sqhk.co/kulobuwaxegu/Qjgqlh2/zelubujugedob.pdf
    • http://reduslim-ufficialesito.site/traffic_rider_hack_apk_download_revdl2kfsd.pdf
    • http://dombitarf.ru/what_are_the_6_conflicts_in_literaturenb26n.pdf
    • http://gordei2d.com/cryptocurrency_for_dummiesdqhsy.pdf
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/6a31151c0e1730b.pdf
    • http://wozupabalaviv.medianewsonline.com/94518519700.pdf
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/8667774.pdf
    • https://cdn.sqhk.co/kewawukufiju/icjcDDh/the_mummy_returns_villains_wiki.pdf
    • https://cdn.sqhk.co/bipozipo/yifibDH/giridobubavebesa.pdf
    • https://cdn.sqhk.co/rarukaboz/g6hdhfE/subway_surfers_unblocked_no_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d3e2abe-2dd4-4c5c-b31e-90a7d65d56e0/what_is_a_visual_learner_called.pdf
    • https://aaf2f8d8-4593-4070-95c3-ed2308805076.filesusr.com/ugd/337eea_1fe783e5e7fe4ce18da5feac63e36f29.pdf?index=true
    • http://piwakitidi.onlinewebshop.net/budgetary_and_non_budgetary_control_techniques_in_management.pdf
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_796970a02c5f4bbbb2c6c525f5e3d4aa.pdf?index=true
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_5805bdae475142a8be84750555f641c7.pdf?index=true
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_5353e9a0c27d46148dc6a78864970b58.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ee4b0ba3-31c3-4214-94af-40111fac2bb5/wosevebaguk.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_off0001032b.bin
631b025c00151d636a8cf91042716de8ef4c1478f6f49ef3cdeef2416d96865b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 5352 bytes
font_01_sfnt_off00011571.bin
a200f93e2c5eedc93f53aa48bc98b508f2b9a53c77d9506f6a07e5fbd0013fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 16508 bytes

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