Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c39ecf1b09e596…

MALICIOUS

PDF

67.7 KB Created: 2021-10-03 14:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 218c52032d070bdc3e6c7250a07e441b SHA-1: 6997c6bd26f50119fdab77ca81b06aedb610444e SHA-256: 95c39ecf1b09e596d12d027d2531234dd3a058b40b7b020542de37618d84efbc
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable link. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot is used to hide an action trigger. The presence of numerous external URIs, many hosted on disposable domains, further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://oniceh.ru/uplcv?utm_term=couplets+rhyme+scheme PDF link annotation
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/sirunavimapaxewetanasodef.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/wuteromebotizi.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/56224567687.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/43537199103.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/jidalumoziranoza.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/53532689055.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/80307766482.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/57361765623.pdfIn PDF document text
    • http://eksternest.be/images/file/remipi.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/dubolufuzajesuluvudejuf.pdfIn PDF document text
    • http://ha-sine.com/d/files/6473344167.pdfIn PDF document text
    • http://medrea.ru/upload/files/bugiluna.pdfIn PDF document text
    • http://zuche0551.com/upload/file/fetaximatubutalezadanuza.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/58850068225.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/badidupesi.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/67086980174.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/46567574998.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/bonek.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/10101989495.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/fusatibati.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8a66f744---zelitowowevemol.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f72a6daa06---77723355865.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/35405524648.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_off0000adcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DD 14356 bytes
SHA-256: 4920515e4106fa0fa553a37cb0399ca9f2f4ff1de53466f7af2516abdaaaa4c4
font_02_sfnt_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 10524 bytes
SHA-256: 4bd7f0c176f8aea3f77feaa1cfa66cd19a67f7002cabcc29f1dc06c313f26692

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