Malicious PDF — malware analysis report

Static analysis result for SHA-256 0869c6587ea4c1cc…

MALICIOUS

PDF

109.0 KB Created: 2021-04-01 14:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4eaeaac694650b688c8088e13e38a7a0 SHA-1: da2915b75cea373f0d840b4796fe6ea5f0edcb2f SHA-256: 0869c6587ea4c1cc6b348925663db88d202f7def7a45329c02a3f4976610f760
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to S3 buckets and other domains, which is characteristic of SEO link farms or phishing lures. The presence of the 'PDF_SEO_LINK_FARM' heuristic strongly supports this attack pattern. While no scripts were extracted, the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kuzutuzo.ru/wix?keyword=black+and+decker+magnetic+drive+guide+set
    • https://takijotirodone.weebly.com/uploads/1/3/1/6/131637658/c995d4b76b1e584.pdf
    • https://maninidepot.weebly.com/uploads/1/3/4/7/134702581/a59782956b4.pdf
    • https://lujisitezolip.weebly.com/uploads/1/3/4/1/134109273/2165006.pdf
    • http://jakiduve.scienceontheweb.net/29981704761.pdf
    • https://natitapa.weebly.com/uploads/1/3/1/3/131379406/fe42ccd4683335.pdf
    • http://kajuzumanaz.sportsontheweb.net/electrical_engineering_basics_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jovekus/basic_electrical_engineering_interview_questions_and_answers_free_download.pdf
    • https://s3.amazonaws.com/kovezodepugov/bit_torent._com_free_for_windows_xp.pdf
    • https://s3.amazonaws.com/fajixe/email_format_for_apple_id.pdf
    • https://s3.amazonaws.com/wifiduxezo/food_safety_license_california.pdf
    • https://s3.amazonaws.com/patotale/1270167273.pdf
    • http://kemesuxaw.myartsonline.com/ginezetufagedufanikezezu.pdf
    • https://s3.amazonaws.com/paxivogedewilu/nusuni.pdf
    • https://s3.amazonaws.com/pusolefosex/57484822582.pdf
    • https://s3.amazonaws.com/godoremitiwuja/gmetrix_ic3_answers.pdf
    • http://nakeviw.myartsonline.com/asme_section_8_division_3.pdf
    • https://uploads.strikinglycdn.com/files/01dbaa2c-22a1-4fdb-9eeb-22830638fc92/psalm_23_1-4_niv.pdf
    • https://uploads.strikinglycdn.com/files/5b302221-10e4-4cf7-afc5-292089466deb/craftsman_3_gallon_air_compressor_replacement_parts.pdf
    • https://s3.amazonaws.com/firudegix/capitalism_lab_full.pdf
    • https://uploads.strikinglycdn.com/files/120a9752-34ea-459f-bce5-02f8a4a5f6f3/gonogu.pdf
    • https://s3.amazonaws.com/sojebelevenex/rezafusugo.pdf
    • https://s3.amazonaws.com/pokixovuxik/wowokelejanof.pdf
    • https://uploads.strikinglycdn.com/files/d27183aa-deb2-465b-a4d9-126acae2099b/tinepuzenugoxote.pdf
    • https://uploads.strikinglycdn.com/files/1f1c6a21-4734-43a9-9855-8f51c57c6cd9/2000_yamaha_kodiak_400_2wd_specs.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015df5.bin
63020ab2630736f3499014596b4d3bf88e52687c9d540206c4d65d9849b6f68d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF5 5204 bytes
font_01_sfnt_off00016f91.bin
88a946e9b6126c2f7f8ccd5ae5a7afbf7629b8ec7aeb441d213803e2cd681be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F91 11696 bytes
font_02_sfnt_off00019727.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19727 4324 bytes

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