Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91afde702403800…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 03:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7db0da96253bc999b2b65fe0285ebe1 SHA-1: 9be6d11d5d3d4a5b770d8df356cb7fbc24ffdcde SHA-256: a91afde70240380011b0cb8c01a83d75675173578a6be802e688f915f5181699
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9830

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://pixomot.ru/uplcv?utm_term=life+after+apk+hack PDF link annotation
    • http://pravkniga.ru/files/userfiles/files/pamokede.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/60361224550.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/12230731875.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/vanar.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/xokafoxolejejap.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/30566243467.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/bejamevijajovalup.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/68174756164.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/55556025194.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/wukosevika.pdfIn PDF document text
    • http://teplospectr.ru/images/files/9191275875.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/25691475528.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/vogunogurazuw.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/72248424175.pdfIn PDF document text
    • http://exim5.hu/_user/file/zolupe.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/zixafegezite.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/bejibaz.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/14052115795.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/16807484938.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/mixaroguxamog.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/4a07e01d01fe60fbe2adc8569e11c9df/kaveg.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/kiwatutazasat.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/92825289336.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/xodew.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/sisarazugoferevulapadew.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/talulidalawasepoju.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_off0000e549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 10188 bytes
SHA-256: 99cad0b5df11744cc329e688a285ff00ea195eebe6382436f6bcea911c533aca
font_01_sfnt_off0000fc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 18384 bytes
SHA-256: 4fdf87ed4c2cf46a69f3ded7661a435fffdbe86dd7662c55e0bc7e00c7313c5c
font_02_sfnt_off00012b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1