Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc07715fafd989f5…

MALICIOUS

PDF

78.3 KB Created: 2021-06-03 14:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b80a5d3cffd8332d44be729c43d6a11 SHA-1: 9b1f528488ef83b793662e1ecd2336f881c9f389 SHA-256: dc07715fafd989f52b4537dbff65b225a32167d2168dd0f99e12d4597ee1cc1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it contains a large number of external links, some of which are part of a link farm. One of the extracted URLs, 'https://drafthe.ru/pbw?utm_term=free+proxy+for+chrome', is flagged as suspicious. The presence of a 'download button' heuristic suggests a lure to download content, aligning with a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/pbw?utm_term=free+proxy+for+chrome
    • https://jixeneneme.weebly.com/uploads/1/3/4/0/134096386/3344137.pdf
    • https://static.s123-cdn-static.com/uploads/4387586/normal_5ff0e84a07e0a.pdf
    • https://cdn-cms.f-static.net/uploads/4455185/normal_5fe8242caf5bb.pdf
    • https://togoxijagujeg.weebly.com/uploads/1/3/0/7/130775712/kexugasewapixejinun.pdf
    • https://cdn-cms.f-static.net/uploads/4376086/normal_604d2111ebdb7.pdf
    • https://cdn-cms.f-static.net/uploads/4500430/normal_5fd795431af69.pdf
    • https://cdn-cms.f-static.net/uploads/4450003/normal_603b143465374.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6dac9ca3-e5b7-49a5-90c9-b1e40e07aa06/how_much_do_miracle_trusses_cost.pdf
    • http://barumena.pbworks.com/f/how_to_become_a_provider.pdf
    • https://uploads.strikinglycdn.com/files/be95f01a-514c-4d38-a057-610fe8c50239/vudolejovu.pdf
    • https://uploads.strikinglycdn.com/files/d53e4a42-930b-45dd-a8fe-a333d6928c8f/fur_elise_piano_sheet_music_free_printable.pdf
    • https://uploads.strikinglycdn.com/files/d47e21fb-6d8c-4286-b570-365b202a9246/67123866403.pdf
    • http://sofutikajen.pbworks.com/w/file/fetch/144456597/zitobox_promo_codes_may_2020.pdf
    • https://uploads.strikinglycdn.com/files/9084c009-375b-4a3f-9508-c86f065d789a/super_mario_bros_2_japan_walkthrough.pdf
    • https://uploads.strikinglycdn.com/files/8956cba0-bb9f-488e-b01e-a0dc3651e4d8/bissell_green_clean_machine_manual.pdf
    • http://mifimoruzuwo.pbworks.com/f/91023225177.pdf
    • https://uploads.strikinglycdn.com/files/1c8428f3-a274-49a0-af21-5b5b0848b88c/how_to_open_a_samsung_galaxy_a10e.pdf
    • http://nunaruribeg.pbworks.com/f/1394092987.pdf
    • http://mutoteja.pbworks.com/w/file/fetch/144504996/10924035520.pdf
    • https://uploads.strikinglycdn.com/files/8d19e1d7-c9d5-42f2-8f5e-2bae74af2631/is_there_a_usa_today_paper_today.pdf
    • http://kizisoj.pbworks.com/f/f6_e3_error_code_maytag_washer.pdf
    • http://foziwedugumu.pbworks.com/f/93030755022.pdf
    • https://uploads.strikinglycdn.com/files/a91bfbca-f7d8-4e2a-89ee-b03a6b530ab9/60898267301.pdf
    • http://zikasamu.pbworks.com/f/titulogar.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f9.bin
eb3e1257d761c309438ca9d18b7cba5a1ef4b3269352581cccfaac9eda7e1831		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 4960 bytes
font_01_sfnt_off000105ca.bin
144e7acfa9f17c9a0a2aa27cc6e00b347c4d3815ee2a873c2c8aeafda4378e3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 11116 bytes

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