Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5df5ff3ffc1d12…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 02:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: b6050306613e53c8fd2b041294c141c2 SHA-1: d47a63c8c7e5c503710672d0285330f121d44d38 SHA-256: af5df5ff3ffc1d12eb87027d7223033123eae7ea51e96a18b3938d84061770c0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it's an image-based document designed to trick users into clicking a hidden action trigger. The SE_PASSWORD_ARCHIVE_LURE heuristic suggests it may be part of a multi-stage attack involving password-protected archives. While no scripts were directly extracted, the presence of numerous embedded URLs points towards a link farm or redirection mechanism, likely leading to a malicious payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://parmalab.it/userfiles/files/kuwexiwuwepoz.pdf In PDF document text
    • http://eurekaelearning.com/upload/news/file/tovagidixevikora.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210908_3D456E008C588E60.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/73184941311.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210926010804.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/lotalo.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/84959044942.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f0dd0aaa5b4cda6f63a4bd0351fb1339/gadinekarebipinoxaputa.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c093926e8082e06e56eec7533f6e8579/61795567579.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/59223687195.pdfIn PDF document text
    • http://giahung.tincorner.com/uploads/files/fivusifodipisa.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/2842350855.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/34105435252.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/xowegimelavew.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/jurudoruzugowazavufus.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/waxonunomarare.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/mukexololaxutew.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210919173213_2033279995.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/suputamifunidaposufevovi.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/ragadetenizuxadalasi.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/35900623369.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/29587710032.pdfIn PDF document text
    • https://strechybenesov.cz/content/8393995045.pdfIn PDF document text
    • https://cartolmania.it/file/sikubanogarivavozasaf.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/jufufevofitobidirolewila.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/dadezoxivik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=clash+of+clans+unlimitedPDF 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_off0000b463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7A 10772 bytes
SHA-256: 0dd970becdaafad3a4eb4a9354b1845a9824c7f37b62ae52bebd368fc514c20f
font_02_sfnt_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 14144 bytes
SHA-256: 16866c199440a79c963fcf305488474147748a5bac48597fc54fee0b97fd612a

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