Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c16cd981e35c1d1…

MALICIOUS

PDF

79.6 KB Created: 2021-04-02 07:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3037c914e9c6efccb4e349600e0f563a SHA-1: d2a03dfd96b822f85cc28b3d3c2080f034ce076f SHA-256: 4c16cd981e35c1d1954d09a4d7780908d59d922cbe2b39ada8ffae33be83dcb0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs indicate it is designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

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://zajinet.ru/wix?keyword=keras+custom+loss+function+batch+size
    • https://cdn.sqhk.co/xakelafu/dhjjgwq/gunshot_residue_on_shooters_hands.pdf
    • http://vetaxevaruli.22web.org/kuvava.pdf
    • http://pusikoxelumide.iblogger.org/best_japanese_learning_books_for_beginners.pdf
    • https://cdn.sqhk.co/gevanadu/ahejgjb/nuts_bolts_shop_melbourne.pdf
    • https://cdn.sqhk.co/muvotugi/wFij7ii/85523220551.pdf
    • https://cdn.sqhk.co/damukowabij/ielSHy6/world_conqueror_1945_apk_download.pdf
    • https://cdn.sqhk.co/ledirevobep/drjiMsM/facebook_hd_video_downloader_apk.pdf
    • https://cdn.sqhk.co/dolafita/jiH7mxy/five_ten_freerider_mountain_bike_shoes_ss20.pdf
    • https://cdn.sqhk.co/tosuwukiwate/Ppzic2V/bigolofajitisok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/73bc5552-a46d-4f23-9b02-446b8adbc873/how_to_reset_samsung_blu-ray_player_bd-p1600.pdf
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_70039f3fad314340a8de42dd0e7f6169.pdf?index=true
    • http://mudotepejix.epizy.com/can_i_put_laundry_detergent_in_my_carpet_cleaner.pdf
    • https://uploads.strikinglycdn.com/files/2f408fef-2d07-4b62-89d7-24fdcea634f5/steins_gate_elite_mayuri_ending.pdf
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_c818d04c01d64a6e84fd0cb2b4b9d96f.pdf?index=true
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_ac4c1431889b461aaee4e9f66739458b.pdf?index=true
    • https://f92484db-e5b4-41f8-9431-508412042773.filesusr.com/ugd/b04c15_643ee77e42954a7392b6c2c157a94a03.pdf?index=true
    • http://jotizepexul.epizy.com/liwuxekibazuku.pdf
    • http://gupupofof.rf.gd/20159014701.pdf
    • https://uploads.strikinglycdn.com/files/bb3ecc5b-cd9a-4554-a362-a04d6d6f8143/fopitaduriwogimazi.pdf
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_8526c4d00a83414692ce8d48bc1dac89.pdf?index=true
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_883de1d2e31b4f8084222b45b4c724f3.pdf?index=true
    • 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_off0000f885.bin
5b874bad676b2b39376446f48e49e7eea9de0246dd2f8c4f25ab286bf7eb3bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 5280 bytes
font_01_sfnt_off00010a5c.bin
274d4d5f3a1b5078b5664e5de137ec01d9424e34430a7f0d7b4be8b1b29c0c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5C 11272 bytes

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