Malicious PDF — malware analysis report

Static analysis result for SHA-256 a632e1fd66de0bd0…

MALICIOUS

PDF

81.6 KB Created: 2021-10-19 13:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ace171ee4d91b4304b2263b549480479 SHA-1: a064b3c9f44ee915d5f1c06fec188726518a9d00 SHA-256: a632e1fd66de0bd0bc9328e62086bfc5c2571ec1b7a78f8a45b4471516cfa58c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit users by leading them to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ansonseatery.com/uploads/files/64552045019.pdf In PDF document text
    • http://malbreil.com/userfiles/file/76508200413.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/xafupifalejome.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1630695866343748903.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/12132196337.pdfIn PDF document text
    • http://kam-era-man.com/89300974371.pdfIn PDF document text
    • http://gaudi.tw/upload/file/74717273639.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/40597638399.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/foberobawim.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98276104068.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/68659244560.pdfIn PDF document text
    • http://change4best.ru/upload/file/12261905960.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/bipufokuxugosise.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/86606524583.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/8896675521.pdfIn PDF document text
    • http://schokofontaene.de/idata/sadexufiwisopodeve.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/botilujunujuni.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/26948050438.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/mizagupidufawafixamivakap.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/41515202979.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/99891342175.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/funuresewewesobokomo.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/95511447579.pdfIn PDF document text
    • https://kueapem.com/contents/files/peporadukikekil.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/48673533836.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/5513605719.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=gunship+sequel+ww2+para+pcPDF 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_off0000daf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 10744 bytes
SHA-256: b20c6857272ea19d37ac31c45f3d9de1ffb544e1064427958f7deef5e16d0a45
font_02_sfnt_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 17752 bytes
SHA-256: 008156b06e444266e8979a9ac532e45b46b23fd9bdb259686a8c6a6951a69374