Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce813dfd1a8ec1e…

MALICIOUS

PDF

70.6 KB Created: 2021-03-17 16:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67c72d7b13f7d12733dc07859b444cf4 SHA-1: 49321d07315fa2788de2439f5c1d14a050854902 SHA-256: 8ce813dfd1a8ec1e2d6705d0a3215b6bb18fac3ca02791c58414c42ebd9b8cae
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious intent appears to be directing users to a multitude of external PDF files, potentially for phishing or to distribute further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=quantum+flashlight+harbor+freight
    • http://gebevojika.mygamesonline.org/23297842173.pdf
    • https://barufaworu.weebly.com/uploads/1/3/5/9/135957986/sanuloxekopikifajo.pdf
    • https://lededafekipolo.weebly.com/uploads/1/3/4/4/134404801/diteluvexogufopop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fojaxexino/how_to_turn_on_kanger_evod.pdf
    • https://uploads.strikinglycdn.com/files/fc64c826-88d1-4eda-90d3-33e9c50a3fa7/24047014003.pdf
    • https://uploads.strikinglycdn.com/files/48fcefc4-a2fe-4108-b9ad-80b8c5cafb38/exocytosis_definition_science.pdf
    • https://s3.amazonaws.com/zubuwujoxom/67479691162.pdf
    • http://rutenodisekorin.rf.gd/sudivivuwarof.pdf
    • https://s3.amazonaws.com/somisilegex/broken_cuneiform_bone_in_foot_treatment.pdf
    • http://menepanago.rf.gd/bantu_languages.pdf
    • https://uploads.strikinglycdn.com/files/5548f41d-5c41-4215-b1bc-c3002fb2a58d/pinod.pdf
    • http://foxukekamusun.onlinewebshop.net/tuxasebowonul.pdf
    • https://uploads.strikinglycdn.com/files/4f6903d9-c5da-4179-bc94-05ce0d7e7dde/jubojowalip.pdf
    • http://suredutika.rf.gd/mixidoxajodujajakavezakek.pdf
    • https://uploads.strikinglycdn.com/files/064c424e-6def-4982-87fd-82181e943952/zenamujafujejesopodu.pdf
    • https://uploads.strikinglycdn.com/files/1b8dddbe-15a6-44ec-b20f-b8c8205f5f7f/torezinowuzosifol.pdf
    • https://uploads.strikinglycdn.com/files/ac72452c-7d30-4612-9526-bfe5950121dc/sugar_changed_the_world_free.pdf
    • https://s3.amazonaws.com/fewifuwu/89054792622.pdf
    • https://uploads.strikinglycdn.com/files/e1ca2229-e1bf-4ce1-bace-eb06235e663d/most_dangerous_game_rainsford_quotes.pdf
    • https://uploads.strikinglycdn.com/files/19115801-b661-472b-9a53-103b077f0eec/sonig.pdf
    • http://tososite.onlinewebshop.net/1932_william_faulkner_novel_crossword_clue.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_off0000d8e0.bin
5377ad27d5a99cea452e6d0dcca3c7e204ca8f2817094ed50a3fc1793a9192e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 5380 bytes
font_01_sfnt_off0000eb05.bin
2ec10ca46ec10f49758a001c812136aa0b843640102884217500bdadfa8fca6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 10080 bytes

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