Malicious PDF — malware analysis report

Static analysis result for SHA-256 697755b0d2e008aa…

MALICIOUS

PDF

69.3 KB Created: 2021-09-10 13:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 1ef42140ec4d91a219cda6da56861c87 SHA-1: 9a61fb5ed830e09dc2b2638d4d6ab799fb5c6540 SHA-256: 697755b0d2e008aada76851bbe5014767959f6e70bcf36da20a62a7820b8a0bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://zezoalza.com/ckupload/files/17070277976.pdf In PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/35028575088.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://myparrotfood.com/user_files/files/wojilanaduzokilamubizofal.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/31796562762.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/94579256478.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/nesibubi.pdfIn PDF document text
    • http://simoncaulkin.com/images/geredalozodof.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///13275897089.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/94755123885.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/sejosufitikafisesagi.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/mudusa.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/94091574881.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/guketinodibabaxeritutu.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/21008482873.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/71144365485.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/jegevevopalusurudokugo.pdfIn PDF document text
    • https://angem.fr/userfiles/file/14188304884.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/dikipiw.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/20445565749.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/23312782251.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/vimuxaxemomo.pdfIn PDF document text
    • https://samowar.me/upload/file/49530541178.pdfIn PDF document text
    • http://onlinevay.com/upload/files/2818311726.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/64425481045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=top+5+navigation+apps+for+androidPDF 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_off0000b27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA91 14796 bytes
SHA-256: a7aa20926bb33581ae8cde76c5d317cd961421152870d0b682210238777a1c53
font_02_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 10660 bytes
SHA-256: c087c5e1d940ee47e6460f445b7e59ed4bf4a1a6a58c8ea36b7e1ce8c116ec0f

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