Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce819eb688478be…

MALICIOUS

PDF

126.0 KB Created: 2021-03-06 16:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03c41f1d2895cddf148cfcda14886a0a SHA-1: eabea7e281facffff2f82369aa5ab73bd1feebe0 SHA-256: 4ce819eb688478be0d68ff9f8255e7286769bbcc25ffec02c777d5d81d4315c3
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, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution document. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage point towards a malicious lure designed to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/aws?utm_term=diablo+3+switch+character+classes
    • https://cdn.sqhk.co/jututumogu/ajeibIk/xoluwesekajowujenolipikod.pdf
    • http://vexasefagi.scienceontheweb.net/78794695348.pdf
    • https://cdn.sqhk.co/bidogefapo/aheIgib/76560361594.pdf
    • http://memiwuv.mygamesonline.org/quality_management_system_definition_iso_13485.pdf
    • http://kirakexig.mypressonline.com/79702610849.pdf
    • https://likunemotiro.weebly.com/uploads/1/3/5/2/135299998/gilagepuwivupa.pdf
    • http://miguxinam.22web.org/8201687685.pdf
    • https://cdn.sqhk.co/vapelomusanu/Khgiaie/backup_and_restore_for_kik_free.pdf
    • http://foxilajat.sportsontheweb.net/dell_optiplex_780_sff_power_supply_upgrade.pdf
    • https://wakokozetu.weebly.com/uploads/1/3/4/3/134307835/9907872.pdf
    • https://relulime.weebly.com/uploads/1/3/4/3/134384492/06fb2a32167.pdf
    • https://cdn.sqhk.co/ronuwimo/CgfxNjg/bubble_shooter_classic_apkpure.pdf
    • http://ruguwafe.scienceontheweb.net/liftmaster_8355_vs_8365.pdf
    • http://feziweninepiv.iblogger.org/edvantage_science_ap_chemistry_2_answers.pdf
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/nusoridofazomura.pdf
    • https://jetisinodab.weebly.com/uploads/1/3/5/3/135335938/309748.pdf
    • https://cdn.sqhk.co/xekemini/tgMjdjd/21618458197.pdf
    • https://cdn.sqhk.co/loziromegon/jiiemih/16834645441.pdf
    • https://cdn.sqhk.co/vozaxodep/aFtqGM3/45367586880.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sefogozi.epizy.com/fixomef.pdf
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_f0bda1b5afe84385b97b7b7617995eec.pdf?index=true
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_da74aef24e384a2d8f031fc1d3e1082e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019787.bin
be7d32c4a8cb31a19d99dfdea5b9d0137d45ffe9aa8da702a5279bd2299a7e5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19787 6716 bytes
font_01_sfnt_off0001ae3e.bin
2816aeba5dc923381ddb2c3698ec3d99f7bda27a24f5847aa001de1cf9da5fbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE3E 5280 bytes
font_02_sfnt_off0001c043.bin
f4a1d6edffcd7cfe7a3cd05c8bb9ec67cd7600d0b59888420dd89939be216036		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C043 12396 bytes

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