Malicious PDF — malware analysis report

Static analysis result for SHA-256 1248e5020dc5e683…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 20:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fa72ac5c0f062091333327af71de53af SHA-1: 37763bc703cccb656d9828a713f937ec51e99102 SHA-256: 1248e5020dc5e68327d16a1b13eaeeff431878c74720fbc8f369b9dfa4a5b5e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dodomacnosti.net/data/file/90869874914.pdf In PDF document text
    • https://digireg.org/upload/tivimelalurowim.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/pemakofafonepiwopejo.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/zidurijenajapafimumuge.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/12056730292.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210909081009.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/tevafoterasodabomu.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/41131753220.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/99018981412.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/94538052780.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/68281434545.pdfIn PDF document text
    • http://rvhifi.cz/files/file/74037011585.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/diwigafawexarop.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///rekumobatoxiletodi.pdfIn PDF document text
    • https://pepsima.biz/files/file/walipugawagil.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/zugazupi.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/natijumele.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/29756918696.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/14638475075.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-5/20210905120041186407.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/61220306088.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/41547444082.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/patokuwuvofajuzaruwalil.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/31771010184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=kp+astrology+software+for+android+mobilePDF 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_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 11172 bytes
SHA-256: 3fd2a0f448e039986a41c86922819dbd7e441739ebccea13fd6aa574ba18aa53
font_01_sfnt_off0000e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 18132 bytes
SHA-256: 264eb1d36b469978ccda4e19a376d41fd0d7c007ac24ca2a15470b21a8fbb42b
font_02_sfnt_off000113f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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