Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8a26c5a9e2cd29…

MALICIOUS

PDF

86.7 KB Created: 2021-10-21 18:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 22f7327bafdef6d46e972121ff8e999e SHA-1: 28fc01c12ffa53e414cc9fc45c7f927dae68c491 SHA-256: ab8a26c5a9e2cd29e5024f53994a49995bed9eb85d7a5a4aad3c711c5ecd76dd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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 http://thecargonepal.com/userfiles/file/46694603951.pdf In PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/tixas.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/10934089077.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/pazulofup.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/84786560798.pdfIn PDF document text
    • http://mdtrend.hu/files/file/tizexomu.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/tipelar.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/36214188421.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4b2b31e68e0741099b1c3f570535741b/55852855355.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///43221809833.pdfIn PDF document text
    • http://allasclub.com/campannas/file/24345978893.pdfIn PDF document text
    • http://allycatering.com/userfiles/mogunukisivurixewatetop.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/51864920792.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/wuwezexesewukejamamolu.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/28310444269.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/jelikusawilof.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/vawanewoxoxemolosep.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/79324103967.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/dipeleturikitesutanuw.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/25522884608.pdfIn PDF document text
    • http://anindecor.pl/files/file/begebitebigakata.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/bizefezawudidezotuzol.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/xebafamexakudafekexinu.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/73741586926.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/xarozefegaxifefik.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/walelolutesazutexamew.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RhDyTiV0TgQ/uplcv?utm_term=cyclopentanone+functional+groupPDF 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_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 10732 bytes
SHA-256: 3888021322c6312317dbb70f5db1c75d5c97f3811fd4807cf43978fd684efa69
font_01_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 18772 bytes
SHA-256: 0c18059781f87530445b37b2f982acdaeef01a8a385708e66904884aa1e3cc18
font_02_sfnt_off0001346b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1