Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad34249d166f5146…

MALICIOUS

PDF

84.0 KB Created: 2021-09-12 18:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40fe79bf92b48e6d4a451b6e50438b23 SHA-1: c9f7c7f95d6ae471612dfb87c4fc7e8b11b35def SHA-256: ad34249d166f5146cd9bfd27c922a293ae8dda66e9d6af7b78b3da5a871ab91a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous distinct hosts and embedded URLs, many of which point to PDF files on potentially disposable domains. The primary purpose appears to be directing users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efdb499c75---nefodiwixixukam.pdf In PDF document text
    • https://kamwalibais.com/userfiles/file/nisizopitogulipasesadi.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/51480300638.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/84686051958.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/80251184196.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/58522000303.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131a315c7b57---golenawugupetubuva.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/10334869436.pdfIn PDF document text
    • http://savemaxint.com/files/file/20001301811.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/sudorekutupigebinizu.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/91793495095.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/sekinifiragusixuselati.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/54174130120.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/39099108335.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/62827186012.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/99996012044.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/riduvodozeg.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/77635240692.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/23391387685.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/99453715177.pdfIn PDF document text
    • https://kopari.hu/files/file/lifejujuritupiwu.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/zufidosovamar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+save+password+in+android+phonePDF 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_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 10588 bytes
SHA-256: 8ea865deecdc990d560e3bf050d6d602eb1686d4a1acf33eba41e10bfbec7cc6
font_01_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 16588 bytes
SHA-256: cb9a6e8527389d2b1564fd18437dca2a9c2b6467b66e1cf633951b3ffa7b4099
font_02_sfnt_off00012a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1