Malicious PDF — malware analysis report

Static analysis result for SHA-256 a623deffab0c1af7…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 21:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea7523aa8f302bb519e0d96e2026262b SHA-1: e5e7f2ea4dbc864478be8b724f65569068669d39 SHA-256: a623deffab0c1af7991a896c50bc9152149647a79155a3446edb3523a25ebe4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a downloader or phishing lure. The PDF structure and embedded links are consistent with a link farm used to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pistant.ru/uplcv?utm_term=osi+model+first+layer PDF link annotation
    • http://www.haztartasigepszakuzlet.hu/pics/file/kavaza.pdfIn PDF document text
    • http://arsvet.ru/img/upload/69625154626.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/xovusofolirojenuturav.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210918_211046.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/borarefojanikobemorebewek.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/31175838762.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/nitadojupemikulefe.pdfIn PDF document text
    • http://cochemical.com/upload/files/68946400255.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/tikobumamobinuset.pdfIn PDF document text
    • http://beeshark.ro/app/webroot/files/userfiles/files/65268213273.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/290ba4bb9e40ae1929e6e26105d8ada0/tedamekodeg.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/11312870381.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613069019814b---juwulowanulenuted.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/mamezipitov.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///sumawibelapen.pdfIn PDF document text
    • https://taperagi.com/contents/files/rogifasobusow.pdfIn PDF document text
    • http://shahgrp.com/uploads/pumumavobiwubevipusasufo.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/buvejusu.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/jakimakusomenizu.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/repibo.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/gejitobivimitofezebuwuxot.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 10548 bytes
SHA-256: 4b13f75619cb78ea00501aa263c919a4de1cf13cd53c85741b6b2da9adc5da72
font_02_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 16224 bytes
SHA-256: 1e1357da365144591930cf171bcf94926d48903a1311bdb81950863089812baf

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