Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7c7db65b4bd4f1…

MALICIOUS

PDF

76.4 KB Created: 2021-04-04 21:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 699e808032bdb5cf9a5c6e307d18c543 SHA-1: 97238cdf56045229f3a0dcb0cb4f22c09dc093aa SHA-256: 3c7c7db65b4bd4f1b2ca391b2e5f36818899e8568d99e4567f6965a9f8cdf862
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or SEO abuse tactic. One of the primary URLs, 'https://dafemum.ru/wix?keyword=gross+investment+and+net+investment+example', is suspicious and likely leads to malicious content or phishing pages. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=gross+investment+and+net+investment+example
    • http://pofuxubilet.sportsontheweb.net/gimizamimu.pdf
    • http://begemot.space/76702113540pg4jm.pdf
    • http://megopoveguvujal.medianewsonline.com/bogleheads_guide_to_investing_2nd_edition.pdf
    • http://ver-alex.website/51590466949rvv11.pdf
    • http://ginalupajeriw.scienceontheweb.net/xozurofog.pdf
    • http://sagunutu.medianewsonline.com/65711622636.pdf
    • http://contentmedialiteracy.com/84465566397uwt8i.pdf
    • http://top-shop-store.website/win_7_ultimate_salam_indirjr0hl.pdf
    • http://ganoget.scienceontheweb.net/cayaponia_tayuya.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zafibimutadoti/andante_cantabile_cello_sheet_music.pdf
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_9a16b1753e124b9198587d5eeaa9aa62.pdf?index=true
    • https://s3.amazonaws.com/rodigapigeta/a-_z_practice_worksheets.pdf
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_e632b14d516b4bbc85a93843f6b637cf.pdf?index=true
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_00d4d93635c6401a9b8b7d49108f5092.pdf?index=true
    • https://s3.amazonaws.com/rilexazejuzovep/how_to_operate_a_power_air_fryer.pdf
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_d865f43a329444eaae6c11dcd30468b3.pdf?index=true
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_399740d9b08b46498a86b96edd421310.pdf?index=true
    • https://s3.amazonaws.com/jupudizadid/the_hunger_games_mockingjay_part_1_summary.pdf
    • https://b27aca93-056c-4dd2-83a6-fd909c9f709d.filesusr.com/ugd/2ba3ac_9ee8c9148d8842899c066f7c513f338b.pdf?index=true
    • https://s3.amazonaws.com/tezofuretejom/87709724994.pdf
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_3f1775adb78d44869f44e2fec9450b1e.pdf?index=true
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_b9cb4beb0b6646bfb26f75834e7811f9.pdf?index=true
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_246d50211b0f44b6be34e5b1ac94da6e.pdf?index=true
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_1743425e13dd4f77bece11ef05d9319b.pdf?index=true
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_16c94a6e948d460c84ecb11c519aae40.pdf?index=true
    • 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_off0000ed03.bin
7ea2f025e1d90eb362113a1d80e1114235c3e0c964c21896b94f3dac08fe5916		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 5264 bytes
font_01_sfnt_off0000fedb.bin
26adbc44b969cad4559b702dc81ef74e0187b83ad7b87a507cec3e23a668df7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 11120 bytes

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