Malicious PDF — malware analysis report

Static analysis result for SHA-256 967284fd90427775…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 03:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0a4ec5efcd4df19a24a0386d1561a96 SHA-1: ebcfc69b6f98ff73c02e469e455db2299fd44d35 SHA-256: 967284fd9042777591e736bc30f39319c5556fa39a1ff6418c3bb3be15ca3ba0
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. The PDF contains numerous external URIs, with several heuristics pointing to it being a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of many external links and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://archism.ru/uplcv?utm_term=android+visual+voicemail+uk PDF link annotation
    • https://monyetjoget.com/contents/files/zavatajutuf.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/nogora.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/81340187.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/nutusiditogurulaguvaza.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/revefa.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109130624493033.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/xomudeno.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/36619073464.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/88820007650.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/73655100597.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/33159393936.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/21554363366.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/tovojuluvizemipitov.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/juxuwusovepiseziledu.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/54574294789.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/23342419513.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/zufipewalonejezusizux.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/84038297259.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/nopirivoxekotazinekolulak.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/65005698709.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/92261743021.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb617d1a58---75501461067.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/jetewulotobesonejonozozag.pdfIn PDF document text
    • http://fnathservices.com/upload/file/6010933974.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/voramopeg.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/durolerozevatawad.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370c1e96b14---dexejitakom.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_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 10672 bytes
SHA-256: 5fecef1d75e874566eea3cac03a526dcb5ee5c0c3ebb132cf62df24fac5b5175
font_01_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 17556 bytes
SHA-256: 849b261eb19636bba35b5a779ee7405278e9080fce4bf726b47221d157a75f97
font_02_sfnt_off00012715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1