Malicious PDF — malware analysis report

Static analysis result for SHA-256 f159a1ed1575c5bf…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 18:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4744f6b01d075b8d9645e144c7271a2 SHA-1: 684cf2c64d0142fdb170074323c7fc8faa3bfcfa SHA-256: f159a1ed1575c5bf84f6fc01373f92b4dd44b4cce61fc5979d2a3aea123c4c49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://massvt.sk/editor_uploads/system/files/puvijuxigimaz.pdf In PDF document text
    • http://marchmontnews.com/imgs/file/72886987100.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/72511587846.pdfIn PDF document text
    • http://hkwwta.org/userfiles/2338003370.pdfIn PDF document text
    • http://popeyebio.com/upload/files/faxar.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/59660151888.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21571782765.pdfIn PDF document text
    • https://cncunse.com/d/files/jimolofopojapi.pdfIn PDF document text
    • http://bakoca.hu/files/file/41185442597.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210905121430.pdfIn PDF document text
    • https://ultralloy.net/upload/files/36390377980.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/10607265452.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/21449529256.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/vutibekelix.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbada25e0bbb1bee426c47d992a8db1f/81397508474.pdfIn PDF document text
    • http://falconltd.pl/cache/file/69031628494.pdfIn PDF document text
    • http://buddhavihara.net/userfiles/file/fibufukilagunabopok.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/ludiranebejoziset.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210918_B1A759E73A839733.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/93074449268.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/40029597744.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/78881348820.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614127cd21bd3---40015934703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+turn+a+video+into+a+ringtone+androidPDF 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_off0000b03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84D 14260 bytes
SHA-256: 7f039a59874b7b998917b3fbd9f1097ccab776f7d70a2b0800ab4173c416d809
font_02_sfnt_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 10452 bytes
SHA-256: 0d9d95ee3cf88f6da4da2f5d030ef2afdc2580b778fb23c78209494c4921357a

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