Malicious PDF — malware analysis report

Static analysis result for SHA-256 15df9358ef0c8b66…

MALICIOUS

PDF

87.9 KB Created: 2021-09-13 23:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 763ad949dc7d9c602b509e9fad8f5f25 SHA-1: abfa07312850ff871635b4a69ba59f3b7d62a998 SHA-256: 15df9358ef0c8b660857ded3f0ea5a1877c6bf27c6ba4cffea05ec008338f5c9
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with numerous distinct hosts and embedded URLs, many of which are suspicious. The document body is heavily obfuscated and likely contains further malicious content or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://2016.letnifestiwal.pl/ckfinder/userfiles/files/50806439059.pdf In PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b64470cca42e348a8825e7f45bf07a45/wuzarivolimojarefaniwem.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/sopovezepowojezowasebej.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/xasarilirivakerenud.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/xogenige.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/kulekisarazew.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/19641857863.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/13779464578.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/38397780645.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/golomikudijemob.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/74803768475.pdfIn PDF document text
    • http://lukinserv.hu/file/82614536338.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/78189341621.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/rebore.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bac748e360---63621236394.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/49835061507.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090217484480554.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/74038586014.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/nakufape.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/79224253035.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/matanafe.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/37015944027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=casino+android+no+deposit+bonusPDF 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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 22940 bytes
SHA-256: 07576d51673805fcaf713da1346c3ef338adbfa2c03170d101d2362b73c7230d
font_01_sfnt_off00012027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12027 10608 bytes
SHA-256: 1879838c4bf59a8113a892dba2b524e2d5687adf7025f06e41c2c35e617fa68c
font_02_sfnt_off00013850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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