Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecf19399ae7a258…

MALICIOUS

PDF

88.4 KB Created: 2021-03-22 13:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4904369274a92fbc2b52725f5972b210 SHA-1: 7fb0bb0e9fc232094aac86d11f1bbc237c6fbb4c SHA-256: 5ecf19399ae7a2580102a09e4e775e415a824da4000b041ad5a083ff37fc351c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://resalured.ru/aws?utm_term=are+water+boatmen+bugs+harmful', is suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://resalured.ru/aws?utm_term=are+water+boatmen+bugs+harmful
    • https://cdn.sqhk.co/ditetona/ggWYX2V/gixonebotidatowaxivade.pdf
    • https://cdn.sqhk.co/zogobadakedu/if9p0DT/3096197828.pdf
    • https://cdn.sqhk.co/tajugajobib/TiaAXic/monster_retsuden_oreca_battle_anime.pdf
    • https://cdn.sqhk.co/rezejigobip/fFjfyha/79693902288.pdf
    • https://cdn.sqhk.co/nujidegowupi/Tjc2Njg/elevator_escape_walkthrough.pdf
    • https://cdn.sqhk.co/letarezetap/BgfBgji/jidetur.pdf
    • http://knitfqph.site/805306665813u1o5.pdf
    • http://tixobewanatit.iblogger.org/1522503637.pdf
    • http://kigurumi.org/yowhatsapp_terbaru_yousef0kcla.pdf
    • https://cdn.sqhk.co/gimanoretev/xOicgf3/46296102192.pdf
    • https://cdn.sqhk.co/tulazofava/hgr3Zja/totopos_dallas_ga_number.pdf
    • https://cdn.sqhk.co/sesekopusoj/eghRhaa/army_car_driver_apk_indir.pdf
    • http://safetymirrors.xyz/what_does_a_song_of_fire_and_ice_mean44egt.pdf
    • https://cdn.sqhk.co/jogowijalaro/CjL0njh/logo_game_guess_brand_quiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_7dcde46aae5143e2a79908a7b6835b5d.pdf?index=true
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_745b2a13537241d9aee9d0333e50eb51.pdf?index=true
    • http://lurapuven.epizy.com/2011_sonata_maintenance_schedule.pdf
    • http://wilikomezavute.rf.gd/bajoxek.pdf
    • https://s3.amazonaws.com/bededuxotulapil/3976360186.pdf
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_21000ef399774c47ac58c1b92544fc22.pdf?index=true
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_1395f25956644d05a86006d34bc6a0f9.pdf?index=true
    • https://s3.amazonaws.com/gedexim/dungeon_master_ai.pdf
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_600144dcfab442c8a8d50cc926ff3880.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010131.bin
cb9072f881c1fe0ad8900bbcc5a20a23fabb306412f64e001cac76c2a9509f2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 2952 bytes
font_01_sfnt_off00010bc0.bin
4dc95c116fe5f2a6b38b12d2e92f285674a5e525dc9af16584a1d3a7efa147d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 5236 bytes
font_02_sfnt_off00011d73.bin
18f843054e0f49bda2d09ddf60739976fdbb411ac40d16a67655f8be92cffced		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 11308 bytes
font_03_sfnt_off000143f8.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143F8 4324 bytes

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