Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac29810ea0c8d43f…

MALICIOUS

PDF

78.3 KB Created: 2021-03-04 04:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 37b7dbe3c57c68dc27011a27b88fee1f SHA-1: 59ff4a421b61eb68ddf5a70b714328750d7a1d98 SHA-256: ac29810ea0c8d43f25572f6636d1b6f00172b415adb668d4a680fd28260c40d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the PDF is designed to host many links on low-reputation domains, aiming to trick users into visiting them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://druttle.ru/wix?keyword=lego+halo+4+mega+bloks PDF link annotation
    • https://gerukule.weebly.com/uploads/1/3/1/6/131606739/mipobuzipuge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489240/normal_6007a75680386.pdfIn PDF document text
    • http://cmbmarketing.agency/fortnite_on_play_storea7ov9.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/4731142.pdfIn PDF document text
    • https://lewubudakaxawo.weebly.com/uploads/1/3/4/3/134342842/mosufuxux.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/keduvuzona-fuwogagaperaj-rubasuweva-porifonifofupo.pdfIn PDF document text
    • http://tixshopclub.fun/grigori_grabovoi_methode_book71x76.pdfIn PDF document text
    • http://vavimaj.iblogger.org/30684995039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501962/normal_5fdba975e86e9.pdfIn PDF document text
    • https://gejodawutu.weebly.com/uploads/1/3/1/1/131164152/e38d7bf37e46.pdfIn PDF document text
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/sakos_jevojutateru.pdfIn PDF document text
    • http://afracheat2.xyz/masha_e_urso_filme_completo_dublado3pla9.pdfIn PDF document text
    • https://dorulitonen.weebly.com/uploads/1/3/1/3/131380258/8993038.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/kesofiwe7p2ne.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479674/normal_60094630a4e02.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/6892711.pdfIn PDF document text
    • https://fukenotaza.weebly.com/uploads/1/3/2/7/132740373/kerigobikiz_netesumidufifo_fudazodile_wajoveleto.pdfIn PDF document text
    • http://gabigad.22web.org/how_to_dj_for_a_wedding.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/basipokuzapi.pdfIn PDF document text
    • http://dimizisunope.epizy.com/xovemud.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/72424737856.pdfIn PDF document text
    • http://wadepexarupuwa.rf.gd/math_problem_area_trapezoid.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 5236 bytes
SHA-256: a294c72cb7b6274ea06492ec9580d48229be950ad1ccd3e658e035aceb8eaa63
font_01_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 10892 bytes
SHA-256: c210bc4bc39773eb9a4b1819978bd7fd62831bc833685d3abef91504252a7c82

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