Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1794ebf5736cbf3…

MALICIOUS

PDF

79.0 KB Created: 2021-03-17 09:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6e86e20d72ab7463ee5421d93faae42 SHA-1: 6566aad599e041e047cdddb53013d33d14647a08 SHA-256: a1794ebf5736cbf3b25b56f6b033a7fea4ca90afe92b037ab2cfcad04784fb15
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or SEO spamming operation. The presence of external URIs and a link farm heuristic strongly suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/wix?keyword=babau+demon+pathfinder
    • http://zuvels.xyz/73060092585ml8eu.pdf
    • https://cdn.sqhk.co/bixatavafut/eYgeG0D/wukidodexedadidaji.pdf
    • http://izzzaaa.space/79838592739pachb.pdf
    • https://cdn.sqhk.co/fuvonazavo/jjjhbNm/strategy_consulting_jobs_nyc.pdf
    • http://voicebftyi.com/xovupejupoy9lxl.pdf
    • https://cdn.sqhk.co/wefopijupe/gpFX3hd/budigasufifoziba.pdf
    • http://ebay-coupon.ru/cute_pets_for_adoptioneozh8.pdf
    • https://cdn.sqhk.co/rajunakeb/1FzooKi/cm_rewards_mod_apk.pdf
    • https://cdn.sqhk.co/sadamire/b8gRCgh/xajatuzewifiwerojujozi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b815c817-5192-4052-960c-8526779030e6/pijofasoxoxok.pdf
    • https://uploads.strikinglycdn.com/files/86ac2dcb-0706-49ff-bdfd-29b6e4d94036/sodaruwojoruma.pdf
    • https://uploads.strikinglycdn.com/files/ee011f24-0b53-4b93-9f69-8caf195ae9db/68519587845.pdf
    • https://s3.amazonaws.com/sazixipame/78442471047.pdf
    • https://uploads.strikinglycdn.com/files/3f3e0913-8146-44f3-9e9d-aaafc2334e7f/how_many_reps_for_compound_exercises.pdf
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_b2d57d02007b40e198fe896444e272e7.pdf?index=true
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_5f0ffd01de9b4a35b57583c2412619e2.pdf?index=true
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_d23bd0308c5d480585b5fc5abf7a4684.pdf?index=true
    • https://uploads.strikinglycdn.com/files/050cd104-ead5-4e91-821f-857d2157125f/23930647065.pdf
    • https://uploads.strikinglycdn.com/files/3d74567a-0e42-43d3-9f81-a152644a8937/rufizowiwetebi.pdf
    • https://b9ecad59-ee1c-469f-8402-ddbad3bf215f.filesusr.com/ugd/84dab8_dc7a4f12479148ea90de41bfc7ab656b.pdf?index=true
    • https://s3.amazonaws.com/lebejos/25015769140.pdf
    • https://uploads.strikinglycdn.com/files/dcd5b7fc-1a9e-4d14-a09e-7ef3e1c0c24d/963511364.pdf
    • https://uploads.strikinglycdn.com/files/e02543a2-8bed-4f0c-9e76-367de48464ba/pride_and_prejudice_movie_free_online_streaming.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f583.bin
d95944fefb69de7f0a3b07fe16d092b28495878e74f94abf00f99fd9d3a5a38d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 5260 bytes
font_01_sfnt_off00010738.bin
2a679313f01c359a33f9f942f384d3b687bf29296190647fe91858b11312df51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 12008 bytes

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