Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a131365f28614b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 04:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e9e1007808a56985f77d5e37883e523 SHA-1: 53b8189bdf9651a33087b7e3e4927e3747098dcd SHA-256: 12a131365f28614b489522b1f422bc9acd51ca86ab3093acc76ae9bcb877cf19
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to host many links on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 4

  • 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
  • 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://synerhu.ru/uplcv?utm_term=length+of+tom+and+jerry+movie PDF link annotation
    • http://skia22.ru/pic/file/83111787297.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210904092153_1610157534.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/77828166018.pdfIn PDF document text
    • https://emenu.hu/editor_up/zifer.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/repojo.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/20601590998.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/nepebixasodizanenu.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/3867374629.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/xiguzozaka.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133e0c693ecb---97813674575.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/nawajebasatolerevivamu.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/76174478748.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/69213287921.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/towurepizomidanupuvege.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/11478750553.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/lilis.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/85457579766.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/turorupebetoz.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/matarufavo.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/luzoj.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/debedokujiwufidurunizaru.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/turirujejonuj.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/zabakaxurojumorekabagele.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/fodagogopamigebegonamor.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 19796 bytes
SHA-256: e99d9f4bac5f15e5a97809fe4c85a8e9704661763183da8f2a42a00872a23393
font_01_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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