Malicious PDF — malware analysis report

Static analysis result for SHA-256 f370eefb6f42c8c6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 13:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a3c0beaf80415a73cfef23a8c3b8b87 SHA-1: d6e98139d71f865cfc94818e051dd9ca95239f76 SHA-256: f370eefb6f42c8c602197c6d08a1c4b59d096d8e18f8dcee64a3f388f4f2e6f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identified it as a link farm. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://quranday.org/userfiles/file/wituwakavuj.pdf In PDF document text
    • http://tischtennis-kiel.de/images/file/53272945587.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109101951138539.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/zolofizimiranaxunofuw.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/xufajen.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/xesemamoguxedo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3985d4c4---71273113088.pdfIn PDF document text
    • http://saint-party.com/media/file/zawadusoxuwitipufipoxun.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/wufenezuzasaxibuvowuti.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/58560634043.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/ronezimadexapajawi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/de3ace85bc74a7a71fe91862f4b2fe3f/44450712301.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/47923322108.pdfIn PDF document text
    • https://bawauang.com/contents/files/87947008537.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/rovojuf.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109121033169172.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/89617741535.pdfIn PDF document text
    • http://findusafranchise.com/files/files/44836355671.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/luruxopemelito.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/11353649486.pdfIn PDF document text
    • https://brukspec.pl/upload/file/kizadodinadudusatu.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/2295667647.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/2187576385.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/tilajen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+eyes+have+it+short+story+pdfPDF 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_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 10588 bytes
SHA-256: e9ab0804700da4d0a88193f9790fb2a9401f9f333456db42e5eb541a85a009c8
font_01_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AB 17872 bytes
SHA-256: 177f507267fb5b048cadb6c0f5778ec8ce64511ab60a7be1db42abe0601c4c9b