Malicious PDF — malware analysis report

Static analysis result for SHA-256 67038188c7629703…

MALICIOUS

PDF

90.6 KB Created: 2021-09-12 15:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1d4fd9a8cc8113687736fec1fa8cfaf SHA-1: 9bfd1b23286b4757c29dd411aea0f8fd6adde849 SHA-256: 67038188c7629703848c70dd06f8db2d0841a923d1e709e6dd8a88e391680857
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, containing numerous links to other PDF files hosted on various domains, many of which are unknown or potentially disposable. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically points to this behavior, suggesting an attempt to obscure the true malicious destination or to distribute multiple malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gld-lining.com/user_img/files/wotirugerufaga.pdf In PDF document text
    • http://easyhypermarket.com/userfiles/file/begofapogobojos.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/pajopajemomitolabafuxad.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/96875105232.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/rapavugofivimufibajomuli.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210906163090923639.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/85717576739.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/26986483331.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/48082009725.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/zukajorog.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/befewalegekogetadefubened.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/7a66b40bba9e9f1e30f741639a85bebe/32889880452.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/wuwonabas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267373e39b---wapoje.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/53696735038.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/36550739444.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/45810001174.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/gavibesogunonuzemufirux.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/luvoda.pdfIn PDF document text
    • https://mihalex.by/files/files/rutalopogi.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/navifofupidufokanewa.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/sowogidumaxo.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/bopizelivuviko.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/39482656303.pdfIn PDF document text
    • https://btegypt.com/file/femirojuni.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/xexizezelojetegaxejetapes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+old+man+and+the+sea+pdf+bookPDF 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_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 19540 bytes
SHA-256: 6c34525ef387942ad57baeb4fc00f43c9cdaa1ecf8d124a932b48174cf8a0c2f
font_01_sfnt_off00012c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C74 10764 bytes
SHA-256: e3c56e8ed83f58b9d000f5f576b32e13140befc364be3f2c2de9e6b0dd0c45f8
font_02_sfnt_off000144de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1