Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed2c1f8d5f41925…

MALICIOUS

PDF

71.5 KB Created: 2021-03-24 22:13:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8691dcf4189d913f0e14ace72ef95e33 SHA-1: d08976e5f97496331fd312c5f100b77345bed132 SHA-256: aed2c1f8d5f41925f7d7aaef14a8fcb1e17f5d11b63e5d0df09b9e2f70c62c4c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, 'https://jacksth.ru/wix?keyword=frost+mage+pve+guide+5.4.8', suggests a lure disguised as a guide. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution via the linked 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://jacksth.ru/wix?keyword=frost+mage+pve+guide+5.4.8
    • http://xilexevu.scienceontheweb.net/what_can_kill_a_wild_boar.pdf
    • http://gukiduwonaxinef.getenjoyment.net/69532533907.pdf
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/770690.pdf
    • http://toworugesolur.getenjoyment.net/lofuwamajotarog.pdf
    • https://titepusigob.weebly.com/uploads/1/3/5/3/135392267/jebimefusosuzowig.pdf
    • http://finonit.mypressonline.com/how_to_use_soldering_gun.pdf
    • http://nukapag.getenjoyment.net/38037161836.pdf
    • https://xoriforibeb.weebly.com/uploads/1/3/1/0/131071072/pinolokulenonos.pdf
    • http://kugewezebuvigiw.mygamesonline.org/can_you_wash_cosco_high_chair.pdf
    • https://xopapirepukonut.weebly.com/uploads/1/3/6/0/136053795/683376.pdf
    • https://norabemomo.weebly.com/uploads/1/3/0/9/130969424/soxesiro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_8b77590a2df9450ab79e250257d49f17.pdf?index=true
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_32eb62ff22ae4744930f38d51efe696e.pdf?index=true
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_3d717195a98741bb916c9f30edc944fb.pdf?index=true
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_3f114fc0da78426d91d68ff3229366ed.pdf?index=true
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_7e8d01ff7af14e9a98ec2ed4f7d69373.pdf?index=true
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_fe2962ce1e36482f989f52e4a1c87553.pdf?index=true
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_838ed72326b64fb798f326b0d08d9dd7.pdf?index=true
    • http://nebojemesiwi.atwebpages.com/bhagavad_gita_telugu_meaning.pdf
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_81ea590879df439a8169d3040418f0cb.pdf?index=true
    • http://ginowane.onlinewebshop.net/70183582276.pdf
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_ddaa45cb9ce1443f8d3a2bb90019056c.pdf?index=true
    • http://wudazebej.atwebpages.com/basics_of_biblical_hebrew_vocabulary_audio.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d747.bin
341ad5b32cd88ab70eb4f77290a5f437f9cc876ec0e342ad4548f117e710c8dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 5700 bytes
font_01_sfnt_off0000eab0.bin
7e07d01d7e2c22ddbccb7eb84f141a4756dfb56c06e229d073ed8e6f24897b14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 12044 bytes

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