Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf6942b45b4dfba…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 02:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 626899a3eefbafe33925ec7541d9472b SHA-1: 65d5892596a418b483dc5e9028656b30a6503e9b SHA-256: dcf6942b45b4dfba92cc03895a747478b977b5e43afba2a4135a845d178e6716
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. This suggests the primary purpose is to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://wedooverseas.com/userfiles/file/14500224136.pdf In PDF document text
    • https://hashtag.school/userfiles/file/pevirikubuselikepow.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/ziveparukuselaloxureki.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/67027182424.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/12875711560.pdfIn PDF document text
    • http://htwy.com/upload/file/boxuw.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/19a9db2690447125a5fb89179e4919c9/142725085.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/paxejirepafe.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/xaziporawulusimomomazo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c139fbcbd277ec24a5813bd7abf1cf7f/xivofavumebodotozomedik.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/pifumagaxo.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/palikatajejubededanok.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/lokokemexiloxiboza.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/varakilifoxafukebajepoket.pdfIn PDF document text
    • https://petribax.com/userfiles/file/bufiwag.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/2201366879.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/99679446253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=league+of+stickman+2+online+fighting+rpg+mod+apkPDF 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_off0000ce72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE72 17596 bytes
SHA-256: 2e5baa68462cfe156e05bda10f0599c2f35589983c0232515afc60769c6773a1
font_01_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 11336 bytes
SHA-256: 475c6474b97608565021ecb34305dbc1a2f6878236ce1ebed0599e2e3be1f0b6
font_02_sfnt_off0001162e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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