Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2389bbafd10ede0…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 20:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c2281197e57d36d0442e70a142a26ea SHA-1: fce8bad19e6044ac106fa3407fae54a652f0c1ca SHA-256: b2389bbafd10ede0ab9d4077ce6ea6ae673a11a14715c9158638ddc39d3e1ac7
134 Risk Score

Malware Insights

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

The sample was detected as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to disposable domains, characteristic of a link farm used to obscure the ultimate destination, likely a phishing site or malware download. The heuristic 'SE_URGENCY_LURE' suggests the document may employ social engineering tactics to prompt user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://caydinhlang.net/userfiles/image/file/jajoputixukudodufemoga.pdf In PDF document text
    • http://koyomisushi.com/uploads/files/92882543655.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/nikuxetesav.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/69541765001.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909210736506931.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/woxafogibujaz.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/lavudasotowego.pdfIn PDF document text
    • http://goldmustang.ru/files/files/kuwakowiduzovozegasiwig.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/zupasobekugemisuw.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109080611585411.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zikaramamuvexirukuxubuw.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/28151871307.pdfIn PDF document text
    • https://uudanbury.life/files/file/dunajatu.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/34911261048.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161331d24f018e---nasobajegozazagebiwexi.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/piwabejujeropebudopef.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/xunabimopo.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/mabupezexomaruzaxubel.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/xabenukoleluzola.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/3365795479.pdfIn PDF document text
    • https://baglab.pl/galeria/file/47753769643.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaad75f41b---91019061685.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/dowozozarebixixorokalub.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/losozixetawatedonawotevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=play+moto+x3m+pool+partyPDF 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_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 18508 bytes
SHA-256: e365db5916d201b1533201564424767182a0e5afec43a9128a2187f56d676d8f
font_01_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 10304 bytes
SHA-256: 2270e5b11538823a325819ffda0f745942407219e1d193511e2664c7f76eac03
font_02_sfnt_off0001252f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1