Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b880564e74f6aa…

MALICIOUS

PDF

97.5 KB Created: 2021-09-08 15:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6e6d5330f8e069ec6b55af50c3647ff1 SHA-1: 6edf3b918e020a0417db5f10a9c170506edd966b SHA-256: 85b880564e74f6aa6e5e1c4bd65b9e8c018fc21f445e077ad77a850c250904c7
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=moll+flanders+book+pdf PDF link annotation
    • http://begues.mobi/userfiles/file/58614340382.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16133d21e72538---33010027607.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/saxapefazunatenuzemewotow.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/86768293552.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/mijafigatovig.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/98946321567.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/mebogovevapadol.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/ralenos.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/43301386642.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/vorim.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/63771185066.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/8360443602.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/28596486121.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/kabiz.pdfIn PDF document text
    • http://zubrcup.by/files/files/30305096215.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/rovojebexolebebitezikod.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/87150292310.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/12746141539.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137da9ad50fc---2653776184.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/zedatorumorivowebaz.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/19595282172.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/lotowamerewevuzino.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/puwaj.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/89129370659.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 18852 bytes
SHA-256: 35b722edb1e85239bfe637cb664b4a271d2dd7b0b7e70f4c76a569982988433c
font_01_sfnt_off00013f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4E 1872 bytes
SHA-256: 79be395588af96fa5df472893822587051e439780fb3f760348c77be68f22830
font_02_sfnt_off00014804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14804 10524 bytes
SHA-256: 9cc1a4a32e42dedb588995e6ea1d3b9949ec2bf3fbca895bae92ad8fa7a1be6c
font_03_sfnt_off00015fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1