Malicious PDF — malware analysis report

Static analysis result for SHA-256 7613c83599801624…

MALICIOUS

PDF

76.2 KB Created: 2021-04-01 10:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5e5363f08079d56209245ae8b028c42 SHA-1: 60237b51d7b43344e63abb90ec0e9c3ef95200da SHA-256: 7613c835998016241933e900e8dfb3c293395a6ad1c9edccc3dc5aad2ca170cc
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely to host malicious content or facilitate phishing. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates a common tactic to bypass security scanners by instructing the user to decrypt a payload, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bologen.ru/wix?keyword=wex+inc+subpoenas
    • http://sirikaf.22web.org/free_download_reader_for_windows_7_cnet.pdf
    • https://garisufusomepis.weebly.com/uploads/1/3/0/7/130740000/nefum.pdf
    • https://subopojulolilat.weebly.com/uploads/1/3/4/3/134319837/0b67d56.pdf
    • https://rugexivik.weebly.com/uploads/1/3/1/0/131070765/fegak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/garorowa/how_do_i_know_if_my_tankless_water_heater_is_bad.pdf
    • https://uploads.strikinglycdn.com/files/47276f3b-ecc6-4217-8001-ac84bd7ccc13/how_to_fix_a_missing_or_failed_printhead.pdf
    • https://s3.amazonaws.com/laradusa/67302764198.pdf
    • https://s3.amazonaws.com/zazelujeju/digital_marketing_seo_interview_questions_and_answers.pdf
    • http://resopuz.epizy.com/54233861724.pdf
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_f046ab59cfda4ac89d00e38055b56e6c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a42004db-66c6-43d9-b0ea-572371450897/washington_dc_weather_underground_10_day.pdf
    • http://vuxikujare.epizy.com/gsk_consumer_healthcare_annual_report.pdf
    • https://s3.amazonaws.com/sesijesule/the_curated_closet_amazon.pdf
    • https://8be317c1-93d6-4444-9a1c-030c84ae583f.filesusr.com/ugd/709942_c0e48cbfa01247168d9f2083eed7a625.pdf?index=true
    • https://def05634-b969-4265-beeb-1e7d695e9a44.filesusr.com/ugd/6865ce_43f1e766ad9144c58ed202a4e4654eb4.pdf?index=true
    • http://luzadewo.epizy.com/sewukigeto.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de66.bin
4c6312f0d64e347ff7300aaef69e84cd01ec1fc74c714087d1edace072292152		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 4824 bytes
font_01_sfnt_off0000eed9.bin
fcaa157ff2dee86a38a5157e40e9d3536d52ef62908e0f13c5722ad7e965e2f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 10968 bytes
font_02_sfnt_off0001143a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1143A 4324 bytes

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