Malicious PDF — malware analysis report

Static analysis result for SHA-256 32aa6f7d8e463933…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 23:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 939a758b7f65a04ca0932093988f8561 SHA-1: e433b6fde9ec2440fb35c27a5c8490c41cd9074e SHA-256: 32aa6f7d8e463933c032f54f3c802876a00511cdcd8cb504ca3d26a9da74e3bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing lure. The PDF's structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://pixomot.ru/uplcv?utm_term=best+gamepad+app+for+android+tv PDF link annotation
    • https://rabudiagnostic.com/userfiles/files/23029661850.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///gilewabotabu.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/42465650303.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090322130921.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/xekajefixavusedogigo.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/marud.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/mexiwubukojoganizadujaxo.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109030826143611.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/padilifofevuvaguba.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/nowizotasumotutama.pdfIn PDF document text
    • http://juncheng.tw/upload/files/77840888886.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/ziwibizali.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/ralazulijunubugu.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/gumokuru.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/16417860750.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/fozabekovegenutazapipez.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/46025322910.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/bigajuwax.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/74721720598.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/fugesavozodo.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/98904080515.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/19caf2af8ceae13ce57748e6599a47e3/radalovapi.pdfIn PDF document text
    • http://clingac.com/d/files/dudiledetono.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/zafalonewevegezavag.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9da42fc45---17598636463.pdfIn PDF document text
    • https://egf.tw/test2/images/file/46333555813.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_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 17412 bytes
SHA-256: 5cacbcd78efba957a556996fffaa56359def34e306e7d65848f306688025b61b
font_02_sfnt_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 10912 bytes
SHA-256: 6762a0d5353b55d1127fce1fa61c5ea58341391f70909c3427fb63d559620355