Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48448dcac09f45b…

MALICIOUS

PDF

89.3 KB Created: 2021-03-11 23:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de1d0d1421608ebfb367107e2a941d40 SHA-1: 902eb2dc83a4463fd4c24288d2253a3968fac912 SHA-256: c48448dcac09f45b38a4fb4eb796a3b67f3a12a824ecf3ebfc0c82f6b63e7090
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to Weebly-hosted PDFs, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jacksth.ru/strik?utm_term=how+to+clean+shop+vac+filters
    • https://fuketuxe.weebly.com/uploads/1/3/4/4/134495293/mabufugu-janewumanu-danitaki.pdf
    • https://gusupaserilobe.weebly.com/uploads/1/3/5/3/135312632/5638844.pdf
    • https://sozizupisez.weebly.com/uploads/1/3/1/8/131872239/71cae559d5779.pdf
    • https://kukuwusak.weebly.com/uploads/1/3/1/3/131379738/firutimaki-letesibaba-wadamugowaz-xasibutotegexe.pdf
    • https://kefepifumadig.weebly.com/uploads/1/3/1/3/131383651/1810867.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/25925d3d-5955-4f11-882b-30af3c78b867/clean_living_norfolk_carpet_cleaners_dereham.pdf
    • https://s3.amazonaws.com/jivamubug/mepuxegenijemikefijod.pdf
    • https://s3.amazonaws.com/xumakomowi/carnivores_dinosaur_hunter_reborn_pc.pdf
    • https://s3.amazonaws.com/tuxexi/fudiminosupabenaralusebo.pdf
    • https://s3.amazonaws.com/fuzafuzeruwit/70910816898.pdf
    • https://uploads.strikinglycdn.com/files/bd315130-4adc-4b5c-af71-05c6ea163d87/97518023949.pdf
    • https://s3.amazonaws.com/jinabisura/zafunuxefavinebudavo.pdf
    • https://uploads.strikinglycdn.com/files/5da7e67d-6df5-44ca-94dd-407cdb97f998/strongman_training_program_reddit.pdf
    • https://uploads.strikinglycdn.com/files/4783f6bb-f9cc-4bd0-a15b-53ad6f8d7158/jijizuzadira.pdf
    • https://uploads.strikinglycdn.com/files/4a0dbd19-94f7-4e18-9f44-3890a59f9f5e/50613981361.pdf
    • https://uploads.strikinglycdn.com/files/6f8028d7-1de1-4cce-8584-b6802dbd7c79/900_watt_microwave_good_enough.pdf
    • https://uploads.strikinglycdn.com/files/13b9dfd9-26a0-41c8-a8c0-337305023300/how_to_change_address.on_drivers_license.pdf
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_ae795ba2183c4ffa9d84e6fdfdce7029.pdf?index=true
    • https://s3.amazonaws.com/gavapozalilup/83740354286.pdf
    • https://uploads.strikinglycdn.com/files/30b17ca0-9335-4c15-8d29-13d86cc401fe/black_and_decker_battery_powered_weed_eater_18v.pdf
    • https://s3.amazonaws.com/gedimuta/utorrent_new_version_free_cnet.pdf
    • https://s3.amazonaws.com/paxunu/68477790205.pdf
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_b2dc7cbec8ff4707a1c15e403ef38807.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c2bec0f-ac35-4036-b6b9-2d0012bd76fc/sennheiser_rs-175_wireless_headphones_and_receiver.pdf
    • https://uploads.strikinglycdn.com/files/4dc9f799-c9b0-4827-9103-a411e581b79b/55370380799.pdf
    • https://s3.amazonaws.com/wetevali/biotecnologia_agricola.pdf
    • https://s3.amazonaws.com/rebesudanolo/bilingual_aphasia_test.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_off00010ff5.bin
5b0b62c655c0784d5093437d5527b76997e2a7313eabffba42be87ac716b1167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 5004 bytes
font_01_sfnt_off000120f7.bin
3d9e93fd943b9f5607fa18185c2edd15cf2271da127deff40159731906ecc9a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 11316 bytes
font_02_sfnt_off00014797.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14797 4324 bytes

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