Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2de8ed216474696…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 17:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f995ff57e0762058b22a79d76e465f72 SHA-1: e0edf538f00b2d743865d59f72e8d92460f5b60b SHA-256: f2de8ed2164746964850157060062b2c3f9befd13dadf96094a72b00eb58f70d
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a tactic to manipulate search engine results or distribute further malicious content. The presence of a disposable link farm on potentially untrusted hosting further supports the malicious classification.

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://alpinashop.rudy-ra.com/files/80878208499.pdf In PDF document text
    • https://atputasbazes.lv/images/userfiles/files/nuwudezok.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210913_010808.pdfIn PDF document text
    • https://zagi.hr/files/46220950969.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/luzagumizoko.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/10858109877.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614699b7ae5d1---pizumoxopi.pdfIn PDF document text
    • https://melz-feu.ru/upload/pixuzutoku.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/65214303325.pdfIn PDF document text
    • http://adatarimhayvancilik.com/Images/Media/files/79823989821.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/2mm9gv6vnlrseclbair6gfp1mh/defevejujifij.pdfIn PDF document text
    • https://nomortiga.com/contents/files/gujisu.pdfIn PDF document text
    • http://smogy.ru/files/files/70987231083.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/zofomebilasuwinaxofabisi.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/38432583259.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/22160698127.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210914044359.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/39373482706.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/70784841283.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/2144887195.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/wukewosuzasojajatukawi.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/92582351607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=unturned+vehicle+batteryPDF 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
font_00_sfnt_off0000ac89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC89 10604 bytes
SHA-256: 8207dd8f1dee7a9bc0b7384f3fa7799ebf42fba05ae96c51ef3f63d9f4d20c5c
font_01_sfnt_off0000c4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B0 15096 bytes
SHA-256: c9097b27d5395ea65425db53ac761cc19eb41d138b87511dbcdebf7948cd85b8
font_02_sfnt_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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