Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0c9fb243b3e11c…

MALICIOUS

PDF

80.1 KB Created: 2021-03-15 16:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 37d314f09649a721820f6dbd2fce893d SHA-1: e7e7edce80b80016371397d2fe294e77f1634300 SHA-256: 8e0c9fb243b3e11c4d109b3c458e3b4de0a3c1dc4a15d3c3c577066da0778b66
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/award?keyword=borislav+stankovic+necista+krv+pdf PDF link annotation
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/bamutewepofom_jaronotasubido_xidagit_pedulipumawafum.pdfIn PDF document text
    • https://rixajijinuroje.weebly.com/uploads/1/3/4/4/134473879/futanusawifejin_zeriretagege_navek.pdfIn PDF document text
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/08d1a63.pdfIn PDF document text
    • https://lejigatoni.weebly.com/uploads/1/3/1/8/131871980/bca9e0e.pdfIn PDF document text
    • http://wezejej.22web.org/how_to_change_a_filter_on_a_washing_machine.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/63af0a91556.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_882961550f1d409bb94e21d926def79f.pdf?index=trueIn PDF document text
    • http://kuzibawo.rf.gd/will_microsoft_flight_simulator_2020_be_on_xbox_game_pass.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_893c73673b42410089c0c8ac8da4e13c.pdf?index=trueIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_ce26f9742b5a4f9280ee33cddc6f0d58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/99257972768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61cd05e0-4777-4243-972e-ed0d703f793d/how_to_replace_a_drain_pump_on_a_maytag_neptune_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/bugarobinavati.pdfIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_62b0f3e5af49454a8c1233fcf7acaf78.pdf?index=trueIn PDF document text
    • http://fozajekipijijax.epizy.com/87075275658.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_15d82a6bbd6c452389e08232699a9fe5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedexim/nefilefupagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb87bd4c-7e8b-445c-81c6-12ffd1881b5f/fokavo.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/non_template_class_derived_from_template_class.pdfIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_0243138c3ed5441daa1940eed524149c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 5324 bytes
SHA-256: 0ccdb8adf08caaeae6ff8e36972c9d0d0bb023e13c820c55809e5cbba436c0da
font_01_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 12644 bytes
SHA-256: 8a970ea46b4a7882628ae182fff1a68c38b13c4c3d27118b418fb04dd146cde2