Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a33d638503a54d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 00:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50792c97c30466c3f25182c48a846168 SHA-1: f440d1f17ca656f99b9fa43cc46ed295840d4f27 SHA-256: f5a33d638503a54d1ae2020c3b676d060045101ce6ac6cc536a32276474095a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of disposable URLs, many of which are hosted on suspicious domains, indicating a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tomasmrazek.cz/userfiles/file/15377646319.pdf
    • http://phamtrangia.site/upload/files/63405547998.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba531a589---lebepim.pdf
    • http://homeloanz.net/images/e/file/pifavitodife.pdf
    • https://aecvfcom.nrgence.com/upload/userfiles/files/detoradabegemevesesujoli.pdf
    • https://aslplastic.com/ckfinder/userfiles/files/69522926920.pdf
    • http://atdawnwelift.com/userfiles/file/69248770741.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210907_CC2A211BD76D2EE5.pdf
    • http://stphilomenaonline.org/userfiles/file/nunelofubupogudavem.pdf
    • http://toanlinh.vn/upload/files/47241312543.pdf
    • http://abpaluso.com/upload/file/xaxawozirizapu.pdf
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/55622613125.pdf
    • http://aasghsflqsae.handylover.com/upload/files/5211250214.pdf
    • http://tycoonmedical.com/userfiles/file/gorip.pdf
    • http://chnli.tw/CKEdit/upload/files/vipudupunow.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359d6fefa88---48345276486.pdf
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/wobakenukekuliduporewisi.pdf
    • https://saksisan.com/upload/ckfinder/files/97004701424.pdf
    • http://alacarte-husum.de/userfiles/file/20372626639.pdf
    • http://prasongp.com/file_media/file_image/file/68546180920.pdf
    • http://immobiliareborghi.com/userfiles/files/63990754635.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b02c6b8e85---jinevelikuralivuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=top+10+indian+apps+for+android
    • https://rt9.rspo.org/ckfinder/userfiles/files/pikabijevug.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 16792 bytes
font_01_sfnt_off000101ba.bin
d57bd009ae7699cc61c4c5638caba928d83508e466cafd500f6de8c9a8905a1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 10352 bytes
font_02_sfnt_off0001192f.bin
f61711a5496b229a2b26e01b169345e806cbd8347f6ab0b0fda00440df7f1c08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 18056 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.