Malicious PDF — malware analysis report

Static analysis result for SHA-256 d02a91cc00f4b25f…

MALICIOUS

PDF

74.6 KB Created: 2021-06-10 12:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6989ed521e1102e1d782a0ed89b81518 SHA-1: c53c423c4f270f23113d2f1461f96c303919c440 SHA-256: d02a91cc00f4b25febc301e800267ed6663009ec1851e8d0ddf83eeb0cfe6029
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a mass external link farm, with 30 links pointing to various domains, many of which appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The primary attack pattern involves directing users to external content, likely for phishing or to distribute further malware. No scripts were extracted, but the extensive link farm suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/pbw?utm_term=poster+maker+mod+apk+2020
    • https://babivefe.weebly.com/uploads/1/3/5/3/135312435/puwevuruduguwi.pdf
    • https://cdn-cms.f-static.net/uploads/4385427/normal_600d6fd7be4c3.pdf
    • https://cdn-cms.f-static.net/uploads/4426071/normal_60259f4f76ef3.pdf
    • https://finukapaxareb.weebly.com/uploads/1/3/4/4/134494590/riwema-kemiwizu-tisofojelavu-nutidepadokodil.pdf
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5fc86b2421c75.pdf
    • https://dafepigog.weebly.com/uploads/1/3/4/6/134605944/e6d2b06b.pdf
    • https://lalurarejodu.weebly.com/uploads/1/3/5/2/135297054/eb72719.pdf
    • https://cdn-cms.f-static.net/uploads/4380379/normal_606a5a432aca3.pdf
    • https://kijujiwovijuk.weebly.com/uploads/1/3/1/4/131453096/5480666.pdf
    • https://bevevigulamop.weebly.com/uploads/1/3/4/7/134759368/9398689.pdf
    • https://gumulopeviw.weebly.com/uploads/1/3/5/3/135348062/lodiguri.pdf
    • https://cdn-cms.f-static.net/uploads/4454684/normal_6023e48a8bd8d.pdf
    • https://gapibuxox.weebly.com/uploads/1/3/2/6/132695643/3493598.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cb9bc524-bc3f-453d-9264-a66e3070ad18/what_does_cc_mean_on_lawn_mower.pdf
    • http://bevojoluvu.pbworks.com/f/call_recording_app_for_iphone_free_download.pdf
    • http://gibuwodebu.pbworks.com/f/pes_2020_crack_status.pdf
    • https://uploads.strikinglycdn.com/files/54876963-8fc3-4e77-beaf-1e0b7b221661/61019724287.pdf
    • https://uploads.strikinglycdn.com/files/329bb6e9-bc93-46d4-ad00-8b1d4bbfe4db/26091956847.pdf
    • http://dawanitapix.pbworks.com/f/harman_kardon_onyx_studio_5_manual.pdf
    • http://jebodigezev.pbworks.com/w/file/fetch/144524874/how_to_run_proform_treadmill_without_ifit.pdf
    • https://uploads.strikinglycdn.com/files/1e373035-858a-47bb-810e-b2dd2f19dd8b/what_does_trans_mean_as_a_prefix.pdf
    • https://uploads.strikinglycdn.com/files/37f4fbca-b460-4fed-bf41-0f37f61921bc/loborobifozo.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_off0000e193.bin
63645b111736cb9624b99c699601d2266c3a944d184c0a9f0d41cf0c4df10ad9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 5412 bytes
font_01_sfnt_off0000f3e1.bin
06f82931014ec7bbd485f896c4b0d5097b197b2981f9fc35865dbb8b57177e5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 12316 bytes

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