Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a7bb9bcde2e3f5…

MALICIOUS

PDF

78.5 KB Created: 2021-09-11 03:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0821b39540cfe1641752bd97fdd581e1 SHA-1: fc39bf9084c67d4969d7574547f92e3a90927ea2 SHA-256: d7a7bb9bcde2e3f534ad308cb202c0350711dc7b8408260634106bffcefbb090
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous external PDF files. While no scripts were directly extracted, the PDF structure and the presence of many unknown-reputation URLs suggest it is used to redirect users to potentially malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://pro-roubenky.cz/UserFiles/File/pagisolegakese.pdf In PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210910234958_640922138.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/54856212873.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/magepamedokedebabobibivo.pdfIn PDF document text
    • https://jotelek.hu/files/file/lojexeferibinolaledotadod.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/66345599178.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/fejojibuninorateb.pdfIn PDF document text
    • http://svx.su/ffile/file/tedowiruxakopinowo.pdfIn PDF document text
    • https://ms01bet.net/contents/files/89782556832.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631026640.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/22543688927.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f806fa768b---84970324129.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/36021824602.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/togawonuwexej.pdfIn PDF document text
    • https://macronew.com/upload/files/wagelasadanufajib.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/4258361125.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/83455924842.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/11006672481.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/93574692818.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/49226623292.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/gufovasiwavo.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/76796020054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=top+ten+android+phones+in+the+worldPDF 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
stream_004_off0001149a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1149A 10540 bytes
SHA-256: 9a38fc23ac821567f3a483b271d8a8c41519aaa500f0163f3177f23f4fbe8c33
font_00_sfnt_off0000ce47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE47 17884 bytes
SHA-256: f089006bc42974090d8cab218d6812acbb0abf6d785f9ebad3214a405130499a
font_01_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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