Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cb3fae2eec98f5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 09:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fbe5e448910d1fed15f681ba50506686 SHA-1: 8f144e13b5cd906d032de5c1e4a796630968d677 SHA-256: d6cb3fae2eec98f5d4054fc0cfcb483e40d94a5f5c0e4d0fcff76ceed155f420
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'download button' heuristic and the structure of the URLs suggest a phishing lure, likely attempting to trick the user into downloading a second-stage payload. No scripts were extracted, but the PDF's structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=vm+player+for+android PDF link annotation
    • https://trongtrucsolution.com/uploads/files/49696182973.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/regiregusetexataro.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/fujaxabugapulopex.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/lulilodegenapudabi.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/fepanafu.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/10597449257.pdfIn PDF document text
    • http://salespate.com/userfiles/file/73266895207.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/bekekuno.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed7981e19---vovokixot.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/jezeturuvebedirefutun.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/kijaneg.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/97114279889.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/bixuvefizasuvusez.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/17785823172.pdfIn PDF document text
    • https://izr.fr/files/43444781656.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210906084824.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/nabupewedasanutebo.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/webot.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/99055410042.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/sivodorudomumaseb.pdfIn PDF document text
    • http://akademibt.com/resimler/files/99126198319.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/livegutike.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/pedejenurudowova.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 10476 bytes
SHA-256: 3783ab8109bbd5b8b271e8c6fa9d65380815d79bbf9b2a38ad5ac5de2bb0ebdb
font_02_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 20440 bytes
SHA-256: 191bfd66de9a898376082f77df24d18211caa8b07ca48b2a04cb0dc526ba7e3f

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