Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fdfc73f4b2bc79a…

MALICIOUS

PDF

91.4 KB Created: 2021-09-12 18:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67dc226534a8673b927bdd400b0d9977 SHA-1: b3ad3ae45933cb7e9747994e8d57df7a0ea1d77e SHA-256: 0fdfc73f4b2bc79a26d0a61a97b7e30b9d54c8a1dffaa6d87839739458bcdcc1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many of which point to other PDFs hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and the nature of the links suggest an attempt to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=download+join+and+clash PDF link annotation
    • http://studiobardinisrl.com/userfiles/files/dasudujo.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/8025704449.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/lujavosovumibelumexopiluw.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/fexizivazov.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/ganopi.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/62260424301.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/bavibosuxowotakuz.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/54016819391.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/30922766688.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/65470021275.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/bexokutexezevimuwuwige.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210902090514.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/34509653059.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/82066298990.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/51621328703.pdfIn PDF document text
    • http://lgassociates.in/uploads/buwaloz.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/60926669913.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/13149684138.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/10894824650.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/fn6kt0gn9s146cnabqcrsn2gsl/nomokavi.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/20335282692.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/41989095825.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/befazamogutubemafulus.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/pekozaf.pdfIn PDF document text
    • http://viorina-deko.com/images/file/salumitulupenofat.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/82814684771.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/4662135345.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/mifeli.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 2128 bytes
SHA-256: 442305b4f54fcca11131d7265c8084a350277580795f89700139d3a221274d69
font_02_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 16224 bytes
SHA-256: 64f0b6da39172dd4ee9c660e9e76f1d0ebbe60724ed3c05c35423f428b189fc8
font_03_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 10356 bytes
SHA-256: d2c7d80b32584643c6799a0a96a3d6525fcc301965082664f17e2ff6a5d1d2cc
font_04_sfnt_off000120c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 24708 bytes
SHA-256: 5f87158016c96db9457f247fa4d8de30ffa7d192642e5c79e898c4f45ddde893

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