Malicious PDF — malware analysis report

Static analysis result for SHA-256 55583906f10c4710…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 02:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 678c4e7a15065fbde7f1e2739b5c62a5 SHA-1: 42c619bf78d25afcf90def2d0858c5b42ef12d07 SHA-256: 55583906f10c471011c939f27bb968dbeaedc68db53b05cc7397db0599fbe78c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, strongly suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://pixomot.ru/uplcv?utm_term=nightfall+keeper+of+the+lost+cities+pdf PDF link annotation
    • http://dijladentalcenter-qa.com/userfiles/file/47474547391.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/75036630139.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/ridotidodupaxakotazutapar.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/28963203728.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/84377515220.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/feguxobopolorusomeno.pdfIn PDF document text
    • http://korytnica.net/data/files/gadujezijek.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613834b9271a7---nikawazupujir.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/38869706132.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/wepagesazavanosaserus.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/40976464585.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/nofatowotud.pdfIn PDF document text
    • http://trovas.com/userimages/1504711032.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///butoporebajol.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/xijekomoburitezabolazob.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/pezosikugeboduxidebola.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/82137837694.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/feketepebowotuxefu.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/dirijuvusekar.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/10825191114.pdfIn PDF document text
    • 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_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 18000 bytes
SHA-256: 5d4b73419a14cae514eaba7b17b10f07d9d4debc8320d0ee52ba800837899836
font_02_sfnt_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 10864 bytes
SHA-256: bdb7142c63c3c3ad27003b80833173e4f6b1c6b7f2184afc7a4f89c01ac2a5ba

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