Malicious PDF — malware analysis report

Static analysis result for SHA-256 8683d6008eee5b85…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 22:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c84272c8500497f7df8df49af48e1c4d SHA-1: c877099fdf665a214ea3d3bb8b9b99240137e351 SHA-256: 8683d6008eee5b85bc250d81a6a989b212bd64c68f1b17f66157ee07dcf7472b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ducthoaudio.com/upload/files/27256096670.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133012d485b1---luranikepudipin.pdfIn PDF document text
    • https://korankertas.com/contents/files/31209127461.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/bovimidodibozabi.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/peloratuxotifapupiz.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/94151265242.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/venudikibimoxoxat.pdfIn PDF document text
    • https://vleek.com/uploads/files/20324785218.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/bidoxikif.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/3923749179.pdfIn PDF document text
    • http://wsm.hk/images/files/kubopupokalubafegen.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/putobulupubuxibowogitizux.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/47642544301.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/36998915447.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614742754321f---titutidima.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81505618514.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/kodegupufogagupavisolez.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/66119814328.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/xitit.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/xurukosotapuba.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/56659780728.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/65623925834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=elementary+linear+algebra+7th+edition+pdfPDF 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_off0000b8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 11064 bytes
SHA-256: 3e5e1379be8c04e6b37d84102845d02e08ffb6a23a69d6eeb0eccd2612972b20
font_02_sfnt_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 16460 bytes
SHA-256: d702c9d9e35a234f90d006a352ead5fa4e66c0de1450ac4d62006895df744175

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