Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3355c55aa3a6404…

MALICIOUS

PDF

85.0 KB Created: 2021-04-24 14:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ce62596c6a0db03d5e63d97e1b406e6 SHA-1: 5d9beb77f0a4767a3a8b996eba27f6f6b6c79033 SHA-256: d3355c55aa3a640483e3b56dcffedd7f2931325c57a06e17b97e9c8e0adedc2a
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating it is part of a link farm, with numerous external links. One prominent URL, 'https://seumenha.ru/strik?utm_term=can+i+use+pampered+chef+stoneware+on+the+grill', suggests a phishing or scam attempt by mimicking a search query. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://seumenha.ru/strik?utm_term=can+i+use+pampered+chef+stoneware+on+the+grill
    • http://xepuvibigin.22web.org/carrom_pool_game_for_android.pdf
    • http://jazejoravasog.22web.org/guidelines_pulmonary_embolism.pdf
    • https://kofepuxola.weebly.com/uploads/1/3/4/7/134718869/c740d9.pdf
    • https://cdn-cms.f-static.net/uploads/4456143/normal_606584ffeca85.pdf
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5fcbbe816ed01.pdf
    • https://cdn-cms.f-static.net/uploads/4459482/normal_60133f604d915.pdf
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/wevemi.pdf
    • https://baraxuworasexe.weebly.com/uploads/1/3/4/6/134633060/064a6.pdf
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5fda801c2cd93.pdf
    • https://pawikewam.weebly.com/uploads/1/3/4/4/134445239/1988024.pdf
    • https://wenewemegidipep.weebly.com/uploads/1/3/4/6/134679414/gikuza_zisilajom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zifilobesumafi/sorosa.pdf
    • https://uploads.strikinglycdn.com/files/c55934ec-e02d-40c3-b24e-69e46e9b55d4/59675022466.pdf
    • https://s3.amazonaws.com/wozoxub/what_are_the_16_personalities_types.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/gusazajefovojisixojaxuli.pdf
    • https://uploads.strikinglycdn.com/files/58ca011b-c581-4874-b913-56e148c300c7/44048292156.pdf
    • https://uploads.strikinglycdn.com/files/46949d7b-f327-4dfa-8956-0d65da36ce39/97175818689.pdf
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_f78e7ddeebdd457fa628d72b5181eef7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1f19d172-ae7c-498d-b1ec-99c0de3c1155/milire.pdf
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_48ab9457d632449d800a7aaa8328d3d6.pdf?index=true
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_b43197e56be84501b8b1c5c7f3802772.pdf?index=true
    • http://kimafixenij.epizy.com/viwanosusupupot.pdf
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_5215daef48a54131bc5845060b4ca33c.pdf?index=true
    • https://s3.amazonaws.com/tuxutedi/kewirudewekuxakunutomotom.pdf
    • https://uploads.strikinglycdn.com/files/8123ce2b-95c9-4488-a2b7-e18c25f35b43/96935468259.pdf
    • https://s3.amazonaws.com/xamibudasagas/what_does_number_444_mean.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_off00010a1b.bin
d88869cfbb7358cdae6fb0e72017fdd64334793247351fc8656f41a190eb0de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 5564 bytes
font_01_sfnt_off00011cf2.bin
14f79562da6f801dfa396817216821577fb5e21a035bcb3b726d8ad44f51fa4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 12304 bytes

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