Malicious PDF — malware analysis report

Static analysis result for SHA-256 719161a84507e21b…

MALICIOUS

PDF

97.1 KB Created: 2021-09-20 23:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 358a6d1d5e0b7cfc6e6502d73c17d7b8 SHA-1: e46ae4b2c444afc218f583d93e4313377e999a52 SHA-256: 719161a84507e21b99a44ccb89ac266fffe05a062fdae91c3f5961530d025161
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as a link farm and a callback phishing lure. The PDF document body is heavily obfuscated, but the presence of numerous external URIs and the callback lure heuristic strongly suggest a phishing attempt. No scripts were extracted, but the PDF structure itself is likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/wifotuwivoxiziri.pdf In PDF document text
    • https://ghnservizi.com/file/rutajoza.pdfIn PDF document text
    • http://cabini.it/userfiles/files/50943205367.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/2233745357.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e23e02868e---56443161046.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441e53ac34d---40958620549.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/zewul.pdfIn PDF document text
    • https://red-adlay.com/upload/files/pisevezeranojisik.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/97087996831.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/92070705626.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/49436795502.pdfIn PDF document text
    • http://donghotam.com/luutru/files/86082569659.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/zuwotikorurodimalenaled.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/novaniripozaxo.pdfIn PDF document text
    • http://stattus.com/assets/file/41279429904.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/miruxusimedada.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/93837033180.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/30881133321.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/92832946602.pdfIn PDF document text
    • http://martonelektro.hu/files/file/8006608669.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/66041673613.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/58156667223.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/tabezorivuwatunaludorog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=unturned+scrap+idPDF 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_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 23492 bytes
SHA-256: f6b17c42c76085f0d358c1be6fdf6a1495418d67d60c91ab74c563ac8073f38c
font_01_sfnt_off000146d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE9 10448 bytes
SHA-256: 137364f173e7efd45839d48d499a6def7e8c881def5106628c404ce2a418ad91