Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ea26468ca419d3…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 16:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a76da9af6dbed5811246969d33d1a9a6 SHA-1: 03a9f0884f3077acf729245704b9c8dbbabd512a SHA-256: d7ea26468ca419d3a80866d641e40434cc7db7497c41bb07293d896ee2581043
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF_IMAGE_LURE heuristic indicates it uses a screenshot as a lure, containing a clickable action that directs to an external URL. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct reading but rather to host the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 0 text block(s), carries a click-outward action, and is only 68 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://irlanc.ru/uplcv?utm_term=how+to+draw+spiderman PDF link annotation
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ce7aba6c78df412c79d0e498cf9a2cf5/kurumo.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/13360705958.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/63317772901.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/73065836132.pdfIn PDF document text
    • http://midospa.com/upload/files/degafudozanorupaji.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/02ef992f65db391e3e01f521e186874d/4790446129.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/edce3aed96169e0f570d4da7af3f0337.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/bepotokavevajowowozu.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/puzogurodinasatofitileseb.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/kixozafidakelipilex.pdfIn PDF document text
    • https://angkalaris.com/contents/files/78652638181.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/tuzejoxenogas.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/5282835219.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/zudinaxopike.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/9931518288.pdfIn PDF document text
    • http://ktcz.eu/files/files/nalewun.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/68473487134.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/25694785689.pdfIn PDF document text
    • http://recviem.ru/img/upload/gakisixigizudomo.pdfIn PDF document text
    • http://artio.pl/files/files/gezijebotorutidebut.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/80689699576.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/77125135377.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/28716369309.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_off0000aff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF7 10584 bytes
SHA-256: c55203cf300edc0196278e93f102a0ca7244ac2a0b2254af8992828494ed44f3
font_01_sfnt_off0000c81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81A 14072 bytes
SHA-256: 126307e2f61dfe5413be8e70840f0cca95ff8ddd909858631dd4d78508f179df
font_02_sfnt_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1