Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07dde3054bdb92b…

MALICIOUS

PDF

77.5 KB Created: 2021-09-20 21:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1272170775a06e387baab0632a69c678 SHA-1: 0f33f67d048166baa95ef4cb49b1e29e2e968042 SHA-256: a07dde3054bdb92bdcf03fb4f00298a6b39f48dc37479eb2985761fcc534ebe1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to disposable hosting and using UTM parameters, suggesting a phishing or malware distribution lure. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=infinite+flight+original+apk PDF link annotation
    • http://pro-group.ru/userfiles/files/wapidufegevugakapuzis.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/53198600415.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/77548986914.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/wofilo.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/tudedegaguxolefixuragu.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/nolajerav.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/90296633086.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/39772809598.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/1529807964.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/xuriwubinuzodafe.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/70559654511.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109161729444860.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/leremadudebefavufolaw.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/bevomikelesobodabobibatem.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae794168d7---38387090381.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/jasafaburobuzezuvaz.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/85728568774.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/nidomifasatom.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/2095877272.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/dixir.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/86376307031.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/59007749136.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/92415083399.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613452359c13b---padomiw.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/98497726600.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_off0000cb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 10512 bytes
SHA-256: 11b33a3b64463b8e51d2a01bc4a84ed84472281d1e4d8a71d9d2008abaa4be2d
font_02_sfnt_off0000fb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 17276 bytes
SHA-256: eaba096a37324b97cdd067523725220f300f641d0c4c25a1e141d58a7499f55e