Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efc15d4ad978670…

MALICIOUS

PDF

71.4 KB Created: 2021-02-18 05:15:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4ecd7c9e65ecc6c8984a141018786897 SHA-1: 26ad3a277700aac6b97c44428cdf681c5deb01b2 SHA-256: 3efc15d4ad978670946421b2f59971413b6930120e1d8c3eddb3acb48d6083ac
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=photo+studio+pro+apk+cracked PDF link annotation
    • https://cdn.sqhk.co/sugutomipu/qjdgdr8/airport_madness_3d_v2_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/ifqC1P4/gun_zombie_2_uptodown.pdfIn PDF document text
    • https://nerukime.weebly.com/uploads/1/3/1/3/131379394/mojipodapesuvej_walesimodu.pdfIn PDF document text
    • https://vadewowiruku.weebly.com/uploads/1/3/1/3/131382700/rigozalekezafum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453743/normal_60041f4b51309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466413/normal_6011edb119573.pdfIn PDF document text
    • http://balifruit.com/alarm_clock_2_mac_downloadg8qqk.pdfIn PDF document text
    • http://majelogajizivo.iblogger.org/charity_commission_safeguarding_policy_template.pdfIn PDF document text
    • https://cdn.sqhk.co/nomavunut/bbjejjj/52640632129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412158/normal_5fd6610b57a97.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/igighjj/32400490178.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://patikogoxuxit.epizy.com/bonofebuwurafofewixuwobad.pdfIn PDF document text
    • http://vodugesivizere.epizy.com/mpn_coliform_dalam_air.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/best_free_keynote_templates_2017.pdfIn PDF document text
    • http://jumerajoge.epizy.com/45546882902.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/44739667243.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/adobe_indesign_trial_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/battlefield_bad_company_2_pc_game.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 5196 bytes
SHA-256: d3d3965baff5d3d3cca4f289ec37fa2da93a02ec461c3eea9dba37898397e9c9
font_01_sfnt_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 9888 bytes
SHA-256: 13424d9f5d5464c66985ddefd8e21147a7ac626123a02d36e5b9167cdb32b76b