Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e3c830c9c83937…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 15:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 873046bb9628e398c928312e564d4994 SHA-1: 6bfb19cf181eb6ae9f9782e1db71bf7eefa16f2f SHA-256: a4e3c830c9c83937fef60c701a0c6d6e626f7c1bce8d25d0d80924014a03b2c3
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, many of which point to suspicious domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the PDF's structure as a link farm on disposable hosting, further supporting its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gniortho.com/files/Upload/file/mivixisobaratixal.pdf In PDF document text
    • http://poliinc.com/upload/files/13291868188.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/zipigijew.pdfIn PDF document text
    • http://orenprom.com/img/account/file/pojetajolabajapiwume.pdfIn PDF document text
    • http://elitk.ru/_files/38479571427.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/92232736244.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/nejorisilupizuwepugoniso.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/71157458583.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/13498929296.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/mavadusarofovojavetake.pdfIn PDF document text
    • http://airzo.net/userData/board/file/puzobemevir.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/nexepovekubokokiva.pdfIn PDF document text
    • http://reopen911.info/media/file/66447822501.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/32ulvo1tbnv65cdbj6v5qu77r6/9198284544.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/46276204549.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343fd50e986---13541406273.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-12/images/files/58925937941.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/51233930279.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/22700409176.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/kunomizitezule.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/rufovavazuxanemadada.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/13865779301.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/tulapi.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/48798762751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=things+that+begin+with+the+letter+mPDF 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_off0000b03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03D 17820 bytes
SHA-256: b17b84a0fecdd506b5f88ea993aa3ac1d67683a5b1b7adb994dab010465e28a9
font_01_sfnt_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 10624 bytes
SHA-256: ca62c5bc307c3f9525ecb677b0424fc66c2cecb1cc68a0f159c66b943571ec5c
font_02_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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