Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c987bf7f924b46a…

MALICIOUS

PDF

80.3 KB Created: 2021-03-18 20:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fca2d131c4e9f0edd72691968b064e4 SHA-1: 135957c7b8971caa27a52d29ada7bd03e2f81154 SHA-256: 6c987bf7f924b46a3f62909794da3a7ecebfc6ba2de9b3e56e37ac53c6960f16
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'soxebez.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are numeric and likely generated for SEO purposes to obscure malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=piercing+aftercare+form
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jixerubowi/78513682482.pdf
    • https://s3.amazonaws.com/kagedatabujo/15244270712.pdf
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_7b48d6faf63e4603981aaa74c78fd5d7.pdf?index=true
    • https://s3.amazonaws.com/tuxenipup/lomevi.pdf
    • https://s3.amazonaws.com/tobojelusiwi/dejoripogukojijig.pdf
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_2a12ff1cf08d4e16b250014200e556f9.pdf?index=true
    • https://s3.amazonaws.com/penale/xejokodeda.pdf
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_53d3067d4a214a82862ff247b9ed58dc.pdf?index=true
    • https://s3.amazonaws.com/bulikowexunepov/losejuwexodexiwo.pdf
    • https://s3.amazonaws.com/xuxifuzituwu/baaghi_2_movie_hd_mp4_3gp.pdf
    • https://s3.amazonaws.com/donake/vosezanokujevozosorajuzu.pdf
    • https://aaf2f8d8-4593-4070-95c3-ed2308805076.filesusr.com/ugd/337eea_f00e3ee7def84369b4cc74a23473db4f.pdf?index=true
    • https://s3.amazonaws.com/nefunupu/why_does_my_kenmore_dryer_keep_running.pdf
    • https://uploads.strikinglycdn.com/files/3fc4c0de-6c9e-4ab1-9b73-d777f963196c/the_princess_diarist_carrie_fisher_audiobook.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/20827124399.pdf
    • https://uploads.strikinglycdn.com/files/5a8bbbb6-9e5a-4c91-b104-3524970bcbf0/aquasource_handheld_shower_head_parts.pdf
    • https://s3.amazonaws.com/lowebemuwojiso/arduino_datasheet_328p.pdf
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_95ed53c0d78f42ce8f65181521cf9bb5.pdf?index=true
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_4f1e1d81c22e438fba25e253127acbc4.pdf?index=true
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_82117c98de4a40d5a5dbe31d05e7664f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeca.bin
9d8dc23f6d33591ff7c1bca95edee3ddc60e9f569c3feaa9de85158b88bcc1f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 4780 bytes
font_01_sfnt_off0000fee0.bin
0552031827d98c232d7ae17da3d69395f62d3fe14a5cc054b8e732b5abaad1ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 10992 bytes
font_02_sfnt_off00012477.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 4324 bytes

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