Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4530889b6a0587…

MALICIOUS

PDF

80.7 KB Created: 2021-03-23 05:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a831bdc707bed84006fd09f4479b8807 SHA-1: e2a7e041ae68564c2a93fb1622666664fa23b037 SHA-256: ea4530889b6a05876981de6dd6a51f3517e096f888a70f025ce34764d632db3f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm. The primary external URL, https://jacksth.ru/strik, suggests a potential phishing or malicious redirection attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

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://jacksth.ru/strik?utm_term=why+you+shouldn%2527t+have+to+wear+school+uniform
    • https://cdn.sqhk.co/vijukifezu/OcgeQOs/wish_memes_funny.pdf
    • https://cdn.sqhk.co/xonipavu/gfAhe3C/senate_election_results_election2020_live.pdf
    • https://cdn.sqhk.co/bubiwalifeda/Zhd7PSI/schumann_resonance_7._83_hz_generator.pdf
    • https://cdn.sqhk.co/rapowipijes/6jchYda/wood_carving_merit_badge_kit.pdf
    • https://pilologalegalek.weebly.com/uploads/1/3/0/7/130740349/6877249.pdf
    • https://cdn.sqhk.co/tezofugowura/ajgl0hf/31606650763.pdf
    • https://sixagezox.weebly.com/uploads/1/3/1/6/131606695/21ef974b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fivadez.rf.gd/sc_cottage_food_law.pdf
    • http://wereguvepowu.epizy.com/feputomuvukuwa.pdf
    • http://mozizilusonasij.epizy.com/webefoz.pdf
    • http://sumidemeg.epizy.com/24461087069.pdf
    • http://najedir.rf.gd/how_to_read_a_stock_value_from_console_in_java.pdf
    • http://fazafowunop.epizy.com/badaxoxekamuvibafe.pdf
    • http://gumizureboz.epizy.com/citra_android_free.pdf
    • https://uploads.strikinglycdn.com/files/5ac07761-cdf8-4787-bc0b-7d72b2d2e6f9/how_to_use_waring_commercial_waffle_maker.pdf
    • https://uploads.strikinglycdn.com/files/9fbb3878-e66d-4f94-bc98-2507ca1df87d/karcher_pressure_washer_pump.pdf
    • http://gasigigi.rf.gd/84597685648.pdf
    • https://uploads.strikinglycdn.com/files/dc783cbd-94c5-4cbf-94e0-37bbb53ffb87/on_writing_and_worldbuilding_download.pdf
    • http://jamebixidi.rf.gd/annadata_bengali_songs.pdf
    • https://uploads.strikinglycdn.com/files/22233574-6e82-4143-9e65-f95f07204ae8/81770314766.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_off0000fa75.bin
f22b1f6142b1dac404e8b7d85ee338ca70fcb9f1007b4da63a83b6c1fec02557		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA75 5560 bytes
font_01_sfnt_off00010d60.bin
16a2d5c3f663e11e76cf30b3c971cde464d6b3ed84a8cb351771697932085187		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 11628 bytes

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