Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb62907a1ed81b7…

MALICIOUS

PDF

87.0 KB Created: 2021-04-04 18:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fce53d6a23247bc7d1be33d58585cda SHA-1: 2fd57fd8c3437480ea7463bce76cc6aa5577c733 SHA-256: bbb62907a1ed81b7c4cdb62d6815ddb9f86a00a7160b033492640e4c5c94ef96
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, with the primary malicious URL being https://nipisod.ru/strik. This indicates the document is likely used to distribute malware or conduct phishing by directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/strik?utm_term=learn+korean+with+bts+pen
    • https://cdn.sqhk.co/fedovusig/TLieLgf/simple_bowling_rules.pdf
    • https://cdn.sqhk.co/bojojiweg/gihahfu/42321582973.pdf
    • https://cdn.sqhk.co/vavewiminiv/gc5dhdt/werewolf_the_apocalypse_video_game_release_date.pdf
    • https://cdn.sqhk.co/figesuweno/ibgfgin/83941155096.pdf
    • https://cdn.sqhk.co/rabataxuvax/BhdRGhb/41110619412.pdf
    • https://cdn.sqhk.co/xusarukave/ihMgchi/83645444680.pdf
    • https://cdn.sqhk.co/fodibaniwe/bjdvfih/fobamozozipevalakomuxupa.pdf
    • https://cdn.sqhk.co/fixikumeboga/hjbjcpn/aeshmas_core_guide.pdf
    • https://cdn.sqhk.co/pufuxogife/eNNPJmn/warning_sound_ringtone_free_download.pdf
    • https://cdn.sqhk.co/nasanoroge/Ljju3hh/xujitu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/defujo/xekubiweravan.pdf
    • https://s3.amazonaws.com/muwemivumazulax/vifagotu.pdf
    • https://s3.amazonaws.com/bomupi/52683468876.pdf
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_d69c9d87ecad44419c6512814d791ff7.pdf?index=true
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_a4ae785530d14743a2feb0ace77b69ca.pdf?index=true
    • https://s3.amazonaws.com/zerejibixupav/plato_republic_online_translation.pdf
    • https://s3.amazonaws.com/jazuravazaguz/box_istick_melo_60w_-_eleaf.pdf
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_b326389c6b6f4d1aa3875120161ac5c9.pdf?index=true
    • https://s3.amazonaws.com/wudibirewuduto/tetep.pdf
    • https://s3.amazonaws.com/mekonulegipero/arduino_ide_software_for_windows_10.pdf
    • https://s3.amazonaws.com/xupovobejanam/codingbat_string_1_answers_see_color.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e099.bin
b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 6588 bytes
font_01_sfnt_off0000f0e2.bin
cbd21abccb6cba78f518a3bb3db1c7c10720737a992b2ad1c1b6a12c638fe6da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 3728 bytes
font_02_sfnt_off0000fe29.bin
b7ab3bb70b153931a3c0222e2b28f2cff996601fae2881c6fdc1bf27fd2b17a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 5112 bytes
font_03_sfnt_off00010f9c.bin
869f196a81e6b6336a3f95e0300f4fd1a27ef0c88e10b11fbec4f3fd44955da0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 11884 bytes
font_04_sfnt_off00013717.bin
794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13717 16168 bytes

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