Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b5d42044c49991…

MALICIOUS

PDF

70.9 KB Created: 2021-09-16 08:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5609ffd521be31b53af315449b245362 SHA-1: d601c7cd2eae03fdb3ae6903830bcd527e6f2382 SHA-256: 52b5d42044c49991d8e82eb782a290b412d1bb678c3f949874293c57dbee83d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior. While no scripts were extracted, the presence of numerous external URIs suggests the document's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=english+listening+and+speaking+pro+apk PDF link annotation
    • http://pspectr.ru/userfiles/file/rodilo.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/22787725637.pdfIn PDF document text
    • https://projetovm.com/uploads/files/94058485119.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/bibelixizebulu.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/65497325524.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/11484109124.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/gitimawetuzulilifadi.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/72463227673.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/nigadifosibopotigozuf.pdfIn PDF document text
    • http://glassick.com/userfiles/file/97561694973.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c08a9bb6b---57536922278.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/78551981681.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/25527527360.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b88985b3f---zimewi.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/voduzisep.pdfIn PDF document text
    • https://felicityokolo.com/file/47907277129.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/rozurelipuxu.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/8728276580.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/soxut.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/wonoz.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/30724494462.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/jiwoxadukafeluzixowa.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210905141738_805998.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_off0000b57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57D 10744 bytes
SHA-256: f8abc48bd6af89defc8ebf51d3955b3f2bcd4c37b19f34e47041c8bd2d1e6222
font_01_sfnt_off0000cdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDE 15548 bytes
SHA-256: cbe8a9cfbe42d7804207d45525cb5f91dc5a13b6774cd6b2753034cb299a68da
font_02_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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