Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1d2f766481675c…

MALICIOUS

PDF

79.8 KB Created: 2021-03-20 04:45:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1ca296beef8bff9cfdd0f33e14be4491 SHA-1: 2f9ff5c01919a590b02966d2cc8a22d846bcde04 SHA-256: 4c1d2f766481675cc3e45ed2573a0db2357b8939a85eace5cb3f12b1884d5393
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://dugedepap.ru/wix?keyword=vocabulary+workshop+level+g+unit+7+answers PDF link annotation
    • http://edevletorg.com/curse_of_the_werewolves_full_apko639g.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/35308104756.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/how_to_pair_bluetooth_to_jvc_kd-r320avjpk.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/sigma_1200_bike_computer_wheel_size_chart.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/19788974106.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/52110014765.pdfIn PDF document text
    • http://sewatumafuta.medianewsonline.com/nelson_grade_12_chemistry_textbook_download.pdfIn PDF document text
    • http://polobasopika.mywebcommunity.org/what_are_the_complete_balanced_equation_for_cellular_respiration.pdfIn PDF document text
    • http://kuzexamipapoxip.medianewsonline.com/84899436995.pdfIn PDF document text
    • http://ewop.space/919413280q0zf2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://koradanizepagow.myartsonline.com/59541363434.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/what_is_marksheet_number_ssc_maharashtra_board.pdfIn PDF document text
    • https://b66a6cc6-7028-4fd7-9d19-084b2b27c535.filesusr.com/ugd/4015cf_ad4893e54ccb45f7a2f979734d1422e2.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_184394bf80444128b29ff57ab87c31e5.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_cb0273561fff4bb1b429d795da825312.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_2919a060495342a08800311d67a09fe6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fixararololu/xepagunebalotudipogafiman.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_81e5b040f4b4491498804c7fdc33c135.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_a222a2dd40d24c168b30e86426b6c0c2.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_6b018b56f07e4e519b8b0fb07cca9648.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/7410657578.pdfIn PDF document text
    • https://d787a32c-196b-4e99-9c98-3ae3c28023f9.filesusr.com/ugd/05b469_3faec42e8f7a480bb789f2a9b015814e.pdf?index=trueIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_31d8f622e2d44afd8a9b8556692c5a8c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 5580 bytes
SHA-256: 5b416e6eee6d71bfcf9069b5c547b201b30980bad5ba1cd6df0a9669a6fb8911
font_01_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 10220 bytes
SHA-256: b47817e81eca5e9ad572b70b5f77e44a8d6c558663888dfe6ce78247a06a82f8
font_02_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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