Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd7ac2a60ccb659…

MALICIOUS

PDF

73.7 KB Created: 2021-09-16 17:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 967d07cf20e70567ebe0576aed34335d SHA-1: e18adf6789def0cc38d0fb5d5a6ebf0faf90c3a9 SHA-256: 4fd7ac2a60ccb6595f324f658f1bbeab6e40bbd45b6dec45a64dfa2ce7b5c3d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the PDF as a link farm with numerous distinct hosts, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are confirmed benign, are part of a larger pattern of suspicious linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://luchetti.it/userfiles/files/24614211721.pdf In PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/6auumbfb0v0vbi9ti0saqjp7i3/neresimegakenaduw.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gigenel.pdfIn PDF document text
    • http://15881588.com/ckupload/files/bizopaperifaleganamusilaf.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/bosonanowaf.pdfIn PDF document text
    • https://sim2007.com/files/regalikutawurakalideza.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/1682191950.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/viwozilanofawurusuravuwa.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/91314674944.pdfIn PDF document text
    • http://offerparts.com/upload/files/xemajiwowukowerikag.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/94628546348.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/disizefizebuxejibazewase.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/92467469244.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/66247044321.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/wiwazekur.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/butaninopibadexijonote.pdfIn PDF document text
    • http://kaies.cn/upfiles/210916143158487388btgh6v.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/ratadejofozuzogidanabew.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/58945546636.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/43874676561.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/80404360287.pdfIn PDF document text
    • https://ka-base.no/images_content/file/29155328037.pdfIn PDF document text
    • https://manenshop.com/upload/files/panuzugefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=perfect+player+iptv+pro+apkPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4d3fce2f84493c00844a3f5d22e80f80/92926727545.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_off0000bf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9B 10476 bytes
SHA-256: 9d6cbf8a2c617e692b874ba0ac8af1e4d16479f90412a3272aff13130aede864
font_01_sfnt_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 16272 bytes
SHA-256: 3be438fb95196f3185641ef6f33def96f5507a05273beedcea5aa755ec2e25b4
font_02_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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