Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08669b3ac7cd028…

MALICIOUS

PDF

85.9 KB Created: 2021-09-14 10:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 356fc1c894c84f83ce54b9c909dabf3b SHA-1: ce2ad8458dd092835926e2d2a60af1f5fc0846ac SHA-256: d08669b3ac7cd028688857b3aa72e6e46214bf9fd7710254ea8ef4428342eb8c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to other PDF files hosted on various domains, suggesting a link farm designed to obscure the true malicious destination. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/92687959747.pdf In PDF document text
    • https://muacash.com/webroot/img/files/56320937253.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/lodubuxovukowatapibudoj.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/54886762421.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161404136a01a2---betetezenizu.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/runuwatunoj.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/fokofesibanimizude.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210908031100.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/ligejibofiwopibuzuw.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/90203011021.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/zokopidabitebesu.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/33089922143.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210910_190233.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/botuuldm7d5c3b6opvd5fdto26/kefinavuvopenaveninos.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/vutadukexidosoteje.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/dowupa.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/zaxozutakizowabalotesi.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/52064425423.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/91385312040.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/tikasikuvukolufakelaxepub.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/lewezumiratuforokojinali.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/sewegiguzamufadoni.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/12486894115.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/29211286434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=jack+reacher+full+movie+free+downloadPDF link annotation
    • 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_off0000e91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 18400 bytes
SHA-256: ce1852806319e5eb0bd2c43312d4c5b54900b71eb8d907bd7ea316e88667c561
font_02_sfnt_off000130da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DA 10808 bytes
SHA-256: e8076eaf590a5d5b27d57bd8b4b9eafcb72feaefcc1d0b1a69ecd893df851fb3