Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f4cd4be87ec0a4…

MALICIOUS

PDF

90.7 KB Created: 2021-09-24 09:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33005992d50c5df18e9570463a7bf723 SHA-1: fbe7082d782e9311c34ff1f1678a7cfbf23656b8 SHA-256: b5f4cd4be87ec0a4a58810f6e003411c6c0f4dfd1d0e7525280ccd382c5be922
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. This behavior, combined with ML and ClamAV detections indicating a phishing or malicious PDF, suggests the document is designed to lure users to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=the+legend+of+tarzan+yify PDF link annotation
    • https://gonguyenkhoi.vn/upload/files/94602694875.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/92856704774.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/mipud.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/48940892086.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/talixeburonafuf.pdfIn PDF document text
    • http://poultech.net/d/files/30370734729.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/binidojez.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/gurununitejojugosirasajik.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/17913941096.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/nubakafi.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/wolazixojivusujekuneve.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613604132d07f---mugadanuwuma.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/30320238789.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/93344135929.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/jemojob.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/zogovapifegusazira.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/36211487748.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/satuvajuwejijapizezo.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/94753077480.pdfIn PDF document text
    • https://ntc-container.com/upload/files/sibesuxejoxuduwizonujires.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/xivukotukikuzofuwik.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_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 21608 bytes
SHA-256: 7bc833ad2d6b7829d9109c9c8d4c7577de0c892147c540150d7702fcd9746e86
font_01_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 10600 bytes
SHA-256: 84f0e6c2196970b34c78c14466e873d4ce7b317058c65e9f87322ec89a7e9b38
font_02_sfnt_off00014429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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