Malicious PDF — malware analysis report

Static analysis result for SHA-256 1582efb7e1fcd6e6…

MALICIOUS

PDF

75.2 KB Created: 2021-05-03 09:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c816731de1d294a7434aa236de2e7d7d SHA-1: 1b00301c3e4c637d9769b571f41cada134752b41 SHA-256: 1582efb7e1fcd6e620b80ffebf1ddda1d3994ca24f8e7bed11ed0a91adc4864d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://zajinet.ru/strik?utm_term=the+yeast+connection+pdf PDF link annotation
    • http://islemleriniz.org/tuwoferipofurigepuwujunk83y.pdfIn PDF document text
    • https://seronenufides.weebly.com/uploads/1/3/1/4/131407086/13f443b.pdfIn PDF document text
    • https://cdn.sqhk.co/fenogate/ZOV0gd3/pusone.pdfIn PDF document text
    • http://yoga-italy.space/souzasim_project_mod_apk_unlimited_moneyviifd.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/fTjfhhm/97762623947.pdfIn PDF document text
    • https://xidatebomi.weebly.com/uploads/1/3/5/3/135326438/kixigaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/c4hbHjc/30313992821.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuruvew/1icImBr/82897663076.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/ekaOhco/lovecraft_country_episode_3_full_episode.pdfIn PDF document text
    • https://cdn.sqhk.co/pawapoma/qhfjfjb/62352167446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_603f522fa06f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425256/normal_5fcb3256d479d.pdfIn PDF document text
    • http://idealica-columbia.site/tipotafebotuxurubikaidu.pdfIn PDF document text
    • https://xalitive.weebly.com/uploads/1/3/4/3/134320973/koperamo.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/ieejfwR/67046427462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476418/normal_6025ee2121c25.pdfIn PDF document text
    • https://dasiwijumajofep.weebly.com/uploads/1/3/0/7/130739595/vifugaxobige.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/marathi_calligraphy_font_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/star_trek_discovery_season_3_episode_5_cast_admiral.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 4956 bytes
SHA-256: 7f5b6c1c9d5cbbf5fea6d3258928928dbc9f74f6bd993ddc39b58b3d2b9dd093
font_01_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 9980 bytes
SHA-256: 9749000e4e9c3029031f165d68ce049c863f71c2b4087dae800c1cf4cc1fd356
font_02_sfnt_off000111ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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