Malicious PDF — malware analysis report

Static analysis result for SHA-256 840927864c5fe0f7…

MALICIOUS

PDF

119.3 KB Created: 2021-03-19 17:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 033ea3183f47ce3f9ea212ed4acc2bea SHA-1: d740d2d1fcd934aa0bccf5852543467d0fca72cd SHA-256: 840927864c5fe0f70c7e5c00dd613c14763fcf866dc34fb2e0f63bbf6beab291
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm, suggesting a phishing or SEO manipulation tactic. The embedded URL and the heuristic firings for PDF_URI and PDF_SEO_LINK_FARM indicate that the primary goal is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=canon+pixma+mx922+remove+paper+jam
    • http://girepodemaz.getenjoyment.net/forever_living_aloe_vera_gel.pdf
    • https://cdn.sqhk.co/lumolixuwo/ihi47y9/domino_line_casiopea_tab.pdf
    • https://cdn.sqhk.co/fuvazuginu/yjfDcgi/basketball_strike_apk_mod.pdf
    • https://xanixozejalupu.weebly.com/uploads/1/3/4/8/134873627/304012.pdf
    • https://pilinasovoda.weebly.com/uploads/1/3/4/1/134132167/7958411.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://ginowane.onlinewebshop.net/agricultural_produce_marketing.pdf
    • https://s3.amazonaws.com/bifadiwuwileji/26940455740.pdf
    • http://revodez.myartsonline.com/67893511243.pdf
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_6297a20a75b746f7bcea1aafcb2996c9.pdf?index=true
    • https://s3.amazonaws.com/lovomijelun/vewetotunilezodumowurunar.pdf
    • https://s3.amazonaws.com/rivazixexuguri/25845050074.pdf
    • https://s3.amazonaws.com/gonima/21718380909.pdf
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_370d1df90105420c87f1b3ad23cf2382.pdf?index=true
    • https://s3.amazonaws.com/tafogusegabomu/basketball_game_fight_high_school.pdf
    • https://s3.amazonaws.com/towakog/antenna_tv_channels_program_guide.pdf
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_566202b6538b46879c1bfd950494ec1a.pdf?index=true
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_b138630e181e4268be2af7e3a27448ea.pdf?index=true
    • https://s3.amazonaws.com/jemisajoda/valkyrie_crusade_guide_2017.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
    • 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_off0000e61a.bin
fe7cb01a8fa1d4faa6574db6f6638170fd02dd0f2273b43ff87b259a847d0e8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 47416 bytes
font_01_sfnt_off000175db.bin
2f698586a469ffa566ed67b599f27e36a0b8850f5856555387571d31d9cf145c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x175DB 4980 bytes
font_02_sfnt_off000186b4.bin
bc7ac6337fdbe9d9faa2b9ea3b697eeb0d79b0aa54b3b63300bdd562d2fb1da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x186B4 10708 bytes
font_03_sfnt_off0001aba2.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABA2 16204 bytes
font_04_sfnt_off0001c0d0.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0D0 4324 bytes

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