Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5f07e0d367bfe5…

MALICIOUS

PDF

100.2 KB Created: 2021-09-22 12:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 73ec95801dbe241802f101ab55a3a12e SHA-1: 6c11a5b42fc9832d192619a947f6b0caf9077f75 SHA-256: 8e5f07e0d367bfe5e82d3b24ffcbe0a924a3ad0509df7ad9cd4e3d4374951182
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links on disposable domains, likely to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://dlevitin.ru/fck_editor_files/files/vavewixilibimidotu.pdf In PDF document text
    • https://airbays.com/userfiles/file/8297194103.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/revegosakalukiremoneli.pdfIn PDF document text
    • https://resicolor.com/upload/files/rubamenegotumepe.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/svc3qudfcfb21b7p2dks18v321/raxisukubipijukazibege.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/serodinopeluwugote.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/piwogekisiwonuvuxiwa.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/golopakez.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/67097047832.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/877474558.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7447139feb6671ff08be72ea0aae66a8/sixibomezuzexakofi.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/42229235206.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/xaruwojumumabujad.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/mogabidow.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/xanunipaderunidumad.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/96205797940.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/42503540204.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/46870668359.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/kemijonexoselemivobe.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/5224364203.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/zuzufujivinegafogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+hack+messenger+without+passwordPDF 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_off00011d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5E 11184 bytes
SHA-256: 04517ffd7e075dc5d921f50251e1ce4afd5a875b4debce9f8df9438dc9bdc72e
font_01_sfnt_off00013730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13730 19012 bytes
SHA-256: 6d76593143309afc98bd9426f429405bc9242f91baddb5109c4f57f78049da9e
font_02_sfnt_off00016959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1