Malicious PDF — malware analysis report

Static analysis result for SHA-256 b549ad4a0ad3a9f6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 07:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1db37e294c6cc71fe877d461375d7880 SHA-1: 42aaec3e4b6f1764719e06c3a9346530b60ad720 SHA-256: b549ad4a0ad3a9f64a362feb27b347180af676bc35fc545dc520835de17790f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to PDF files hosted on various domains, suggesting a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the true malicious destination. No scripts were extracted, but the structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://weifong.tw/fckimages/file/19490489763.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613140f9b6eea---13240125445.pdfIn PDF document text
    • http://linker-apps.com/files/zasukabavaram.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/somunisoguxivamotetuso.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/masutasamumimijesapoxi.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/11765422371.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/kizonamedevaval.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/tadotoxuguvoxeluvufefi.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/88861404105.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/zesoval.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/53638297369.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/napezutegikenedow.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/pekez.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/tabunawoxazagagebinez.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/81155477659.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130db69da450---93502845282.pdfIn PDF document text
    • http://www.moyekolodin.com/files/61304365962.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/wenapogabij.pdfIn PDF document text
    • http://101balkon.ru/upload/files/80598077856.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/59746289178.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/fexekawemasuziwe.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/webukepuwijuvoxigutifi.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/ravulusulowi.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/mexejobisegux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pray+believing+god+will+answerPDF 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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 10732 bytes
SHA-256: e31d7966fb2f77f8b0d2a700f9ea9d0b2eb149721a96ffc48094d39b4b8ea392
font_01_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 17932 bytes
SHA-256: e8b387d92c8ee8e9d897d09d940f765442d6c6a9194f0ddd745b4e8ff3593fd6

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