Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae64a83e8d43e60…

MALICIOUS

PDF

80.5 KB Created: 2021-03-19 13:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 845b121b38701343bfc6ae590c44b123 SHA-1: d6f8cd0038dc40b79a2789e60c3da030800b8f33 SHA-256: 3ae64a83e8d43e60cc54712d59facbbd48eb972ab5bac344f72ebe1b9bb9bff7
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a large number of external PDF links. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'police intelligence operations' and appears to be generated by wkhtmltopdf, suggesting a potential lure. The primary attack pattern involves directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+police+intelligence+operations In PDF document text
    • https://zunarorukozem.weebly.com/uploads/1/3/4/0/134016655/sonoketudisepuz-lotalafox.pdfIn PDF document text
    • http://meetsalle.xyz/zelupolaxidufil0q7l.pdfIn PDF document text
    • http://sallehub.xyz/63443864886vxrxw.pdfIn PDF document text
    • http://pshcomonhere.xyz/dukaresenozof1e788.pdfIn PDF document text
    • https://sobafezusebe.weebly.com/uploads/1/3/5/3/135335887/3240944.pdfIn PDF document text
    • http://tryplafond.xyz/39419779026elgzi.pdfIn PDF document text
    • https://wigadanoj.weebly.com/uploads/1/3/4/4/134404864/ae7ee.pdfIn PDF document text
    • http://martakkord.ru/3170847261eaxln.pdfIn PDF document text
    • http://peuer.xyz/wheres_disneyland_in_floridacro65.pdfIn PDF document text
    • http://axecheat1.xyz/46666634613z4o6y.pdfIn PDF document text
    • http://afracheat2.xyz/hernia_discal_tratamientolc8qn.pdfIn PDF document text
    • http://biomaniks.website/convertir_de_a_word_gratis_onlinefqe3m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_31f46cc78495465cb5a8c3722259e924.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_1cb66dfa8b624f2d9820924087b4ee7a.pdf?index=trueIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_6ab04ddc667548ee90116bad5d1dd91a.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_59ae0944f76545cb8a1ff55a18968c2d.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_4290aec612094835a3be03b074dca825.pdf?index=trueIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_5be4cd57f6524734917c1546a1656cf8.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_9436155d3f574cd39966d0f9bd72d2e3.pdf?index=trueIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_51359c18566f4758a4410d2b2fe84901.pdf?index=trueIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_e6e3e9d3c6cc4d3fa2bf80c84c3948ac.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_25d5604568ee41b1a2a055a724899eec.pdf?index=trueIn 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_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 5208 bytes
SHA-256: 52021fcec333cd2e7048e3ff75e53eca046ee46a824eef1be24755ecec152312
font_01_sfnt_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 11800 bytes
SHA-256: 3e668254c48ce447f717f63ec8a4f23b1de563b2be5c0037f4cbb9c5f187783f

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