Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc91a8a2a889ca1…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 20:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 803d7e6ba0c15afb15b1ba9e4d918519 SHA-1: 36e79f7c1cb0679423946d5619217024eba687a8 SHA-256: 1cc91a8a2a889ca13a85d0ea77702ba8ddc0a9d2b480c351db66e331c37c2d13
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware disguised as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=contact+backup+apk PDF link annotation
    • http://askort.pl/Upload/file/59127777568.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/g8rcmpvvkifprm4hbtj8h8kq87/91071699728.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/99558009248.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/76253146811.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/49404335041.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/pidexewikejebalumetadiz.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/solojawukexofidewomori.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/tonudoburenadoxapuz.pdfIn PDF document text
    • http://babamoleskine.com/files/file/jefaboruwejokimovej.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/76652960834.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9399cd73c---52012377247.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/nolefivemabapedoxanavim.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/72454462934.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/nemiji.pdfIn PDF document text
    • http://gerocuki.hu/user/file/neratexipufam.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/32873546200.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/15574339414.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/vagibizefipesib.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/67976912071.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/54297901569.pdfIn PDF document text
    • http://coumert.com/images/file/49333128612.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/24004323769.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/vagugunijifutileb.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/wixaletopulasularojepub.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/74385456944.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_off0000ec59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 10192 bytes
SHA-256: 9f93d473bd4e6dff718d2cad8ce3cf95d5b1d6a08c23fc429c7205b6a4bb1b0e
font_01_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 18356 bytes
SHA-256: 4af40865cfb580a826ce4f0e9bb7fbb52a8b9cd9329235811eabfab253004387
font_02_sfnt_off000132c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1