Malicious PDF — malware analysis report

Static analysis result for SHA-256 888d5a41f5115ffd…

MALICIOUS

PDF

73.0 KB Created: 2021-03-16 07:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b7bb6c2b47f007b009d7b6068c39dda5 SHA-1: 932d7c9b81914eca673c3bdfcf205e95ce8b6023 SHA-256: 888d5a41f5115ffdef67d05e02c4263b7dd3b622f9679fa38a3e54bbc57cdfe5
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://fokemale.ru/aws?utm_term=big+little+lies+2+novel PDF link annotation
    • http://wagajikis.iblogger.org/bluetooth_computer_windows_7_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tujarazimok/diaDAjh/84344703169.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/IuAzhaU/ted_bundy_netflix.pdfIn PDF document text
    • http://lazezubeb.22web.org/petadikotasudoba.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/iccijib/cheat_strike_force_perang_galaxy_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sowotewope/bgcIF5G/79835947492.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mozutulobiris.onlinewebshop.net/wefata.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/matulumib.pdfIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_500a4a58e69348a9bbd6dcef24be202f.pdf?index=trueIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_5a673ff88e424bbc8867e147101e0676.pdf?index=trueIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_e640e7eb2ba54c4796097dcddccaa9d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dusined/firezimetodinixevoxiwoze.pdfIn PDF document text
    • http://fukedega.epizy.com/cisco_7941_firmware.pdfIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_2708a516b82e4a09b58121af032a5bfb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/2017_acc_aha_ventricular_arrhythmia_guidelines.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/bruins_schedule_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/how_to_move_to_a_different_breakout_room_in_zoom.pdfIn PDF document text
    • http://xizanisud.epizy.com/synthetic_antimicrobial_agents.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_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 4788 bytes
SHA-256: d74729eb8678701bbf7c616e7c38a8eed31288ea7be94bdad5aec75455c2105c
font_01_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 11296 bytes
SHA-256: 5c539b3cb5b29825bf170ea0f0dfe68fa8414d4cbfd7eca453ccb699a32045fc

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