Malicious PDF — malware analysis report

Static analysis result for SHA-256 89487303ecc1f300…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 03:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57a5c95741f50336d4e0681f24671fd6 SHA-1: 180b31b35d93b5caf76f760d22176f125432500a SHA-256: 89487303ecc1f30079dd4c15c04222bc6b0788dad3549593e72ec40200132e6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The PDF structure and embedded URLs indicate a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=share+ical+with+android+user PDF link annotation
    • http://refah4ter.info/basefile/hotelrefah4terir/files/86741008779.pdfIn PDF document text
    • http://shamayachts.com/upload/file/24253680675.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/wegonusogowugatuxivikizo.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/86670684497.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/80996378714.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/36078753261.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/roluxivozokexopod.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/latozolusi.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/89403761370.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/98e5f2deecfa9d043a325e8f6a085372/15057342573.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/85415239572.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/83118055708.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/8045149032.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/pogubaruwogumamosijotad.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435097023e3---lonenadituxigik.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6137F3D929978.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/20118984346145109cd9a2e.pdfIn PDF document text
    • http://shosholoza.de/file/83700580787.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/janikixijibaw.pdfIn PDF document text
    • http://vina2002.com/uploads/files/48947672730.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/99608645294.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_off0000d2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 10728 bytes
SHA-256: e54684404066e2adbaeff2bd38a1a12682f918bb5ebd4da269c4741391a81e06
font_02_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 18968 bytes
SHA-256: 00c54b85673c3a92515b7fe85e91eeb74bd63a28e6a61fb0c3f74074e7ad60bb

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