Malicious PDF — malware analysis report

Static analysis result for SHA-256 e987bd8cc2ed4062…

MALICIOUS

PDF

71.6 KB Created: 2021-09-24 13:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44c92d71eb64fa4f1c6fbdcea47228fd SHA-1: c30603f00f2e91321b6115ee547c154d3e801d7e SHA-256: e987bd8cc2ed406225d96e207a8535ac9f2e4811b9dc5f83917ee9421ec543c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically identified as a redirector with a UTM term, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=ben+10+alien+experience+app PDF link annotation
    • https://www.alugutader.fr/ckfinder/userfiles/files/5869124534.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403bd894f04---bimewewinigekuji.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/75727451494.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/4567792468.pdfIn PDF document text
    • http://sun-tes.ru/files/file/vogoxigewesizawajezi.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/wisubu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fuxudilewuxedisetagew.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aac4350469---zuxaki.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/mumizeger.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/vodumiwanarofejofaxukiwe.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/diwizituzifut.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/mepedomijirosowaf.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/gigomuzedisaxaziti.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/suvuxibikaguvabete.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/71097583720.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/niribexevejatilepodanomu.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/17039509061.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/1664834474.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/83741465550.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/sidajosadifebuletude.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/sirapijifoxovafugam.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/26392136938.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/78963866871.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/vugesomokilijalazakuz.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/29699021186.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/92828428215.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_off0000b2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C4 10312 bytes
SHA-256: 11cff58fbee846acf40c0052c628bc087e07653e943576c9525669304599fb5a
font_01_sfnt_off0000ca23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA23 18512 bytes
SHA-256: 0ed91aeaf6e2454efe885ad569a3f69124087807f5bee5a4b099412592485349
font_02_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1