Malicious PDF — malware analysis report

Static analysis result for SHA-256 601f0516478356bd…

MALICIOUS

PDF

77.0 KB Created: 2021-10-07 04:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 487be21c69c5502472b5fcac495b927e SHA-1: b6e4e230c6cea1c48fef9b7dc8b251394f6d7389 SHA-256: 601f0516478356bdf88374ae923e78c040ec81c494f0797a15bca592903b25c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of multiple unknown URLs points towards an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.prctech-th.com/ckfinder/userfiles/files/tatuvije.pdf In PDF document text
    • http://jtour.vn/userfiles/file/supojinunuwojo.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/litibazebizokur.pdfIn PDF document text
    • http://inercial.es/uploads/files/39139293129.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/13719853097.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/80398880420.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/27259819317.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/rogurigakavimaxafaroke.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615303f7136cb---vibefazep.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/suziruluvuvilesemurox.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/tazitagojojelawejabemufuv.pdfIn PDF document text
    • https://nesbedcollege.com/singhania/downloads/file/88745269826.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/piguzatezomaditeje.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/rukupe.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/womozuzabuxavula.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/83ab822e1fa0c4cb7199c3d728e11236/91269753864.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/80134539294.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/fopisopixej.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/2598401050.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/masivexakapit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=american+english+for+toiletPDF 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_off0000c4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 10764 bytes
SHA-256: cdb6f61f23f4b9f3c60db3b91f0181ee8b2a181d00e2c329cf31fdb1ee5fe21d
font_02_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 19204 bytes
SHA-256: 51548ec86333ce39aea00fe149aef7ecbf7b75066516fe89b0d463bbe3d5ca59

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