Malicious PDF — malware analysis report

Static analysis result for SHA-256 efaa26f6d436d811…

MALICIOUS

PDF

68.2 KB Created: 2021-10-03 19:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 475a0dd49dbaabe4629b0730a49e6467 SHA-1: 95a4e9d6a557038a042d724607a836e8c2b0b826 SHA-256: efaa26f6d436d81155c81c9dc767679d1832bd74961c5c2198b218f9d3528c2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to suspicious PDF files, suggesting a link farm designed to redirect users. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing attempt to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/kimiti.pdf
    • http://autosoftware.company/autoresponders_images/files/812323482.pdf
    • https://commonlawhouse.in/userfiles/file/mofuwagadukupusowu.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/b481951pkg8rdglutao2gjgm24/xagixipobebadebutozid.pdf
    • http://ebslang.net/_UploadFile/Images/file/tedodidezemivi.pdf
    • https://fitvital.hu/userfiles/files/fuposiseraga.pdf
    • http://ros-audit.com/i/up/file/81083375711.pdf
    • http://hqshop24.com/userfiles/file/77093669228.pdf
    • http://architettoannalisatinelli.it/userfiles/files/95658802793.pdf
    • http://patanamachine.com/imgUpload/files/kipamipikovodasukemaxuwo.pdf
    • https://isabellepieman.com/userfiles/file/56010932066.pdf
    • http://doktor-okonski.pl/uploadimg/file/sadulaj.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/84625c2fe648002502536bc5134180d3/25869612520.pdf
    • https://777mto.net/contents/files/garug.pdf
    • http://studioguagnoni.it/userfiles/files/soninojij.pdf
    • https://biharlokmanch.org/userfiles/file/69279183243.pdf
    • http://belean.pl/userfiles/file/3747315739.pdf
    • https://digitaldaya.com/imagenes/file/lumaxifeg.pdf
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/5469620207.pdf
    • https://jagamimpi.org/contents/files/4028725521.pdf
    • http://obras.ru/sites/default/files/uploads/23438360054.pdf
    • https://istanajpdua.com/contents/files/tedexutox.pdf
    • http://bancodevida.com/bancodevida/admin/images/image/file/72844214903.pdf
    • http://auburn-companies.com/userfiles/files/desolirujugugazufunudis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=himalayan+cat+for+sale
    • 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_off0000aeab.bin
4e4479820bf4d59eb0bc1c7687ddbdd0913573508a760136468597d54c19f5a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAB 10604 bytes
font_01_sfnt_off0000c6e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E5 16792 bytes
font_02_sfnt_off0000def7.bin
992218d7a5c4a624975742b669fdefcdd4f41a0863224a73eb91f071c3628dcb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 14596 bytes