Malicious PDF — malware analysis report

Static analysis result for SHA-256 1103ae37e812c163…

MALICIOUS

PDF

80.9 KB Created: 2021-03-16 08:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7e4c716e3d4140c3621090668f75471c SHA-1: 2100f7dc0a529cd63a2e6ac031a6633dcf4ef8d2 SHA-256: 1103ae37e812c1637fc7be819d04fad553d0e5bbffb3c4b3ea9cf81a56f0a0a1
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to search terms, directing users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=causas+de+contaminacion+del+suelo+pdf PDF link annotation
    • http://tizezs.xyz/role_of_medical_social_worker_in_community_healthbj4il.pdfIn PDF document text
    • http://zujonatuvetivux.iblogger.org/bahubali_2_video_songs_kuttyweb.pdfIn PDF document text
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/sigetakegidoja-taxexuditis.pdfIn PDF document text
    • http://newsportstechnology.ru/how_to_convert_png_image_to_jpg_on_macfwmbz.pdfIn PDF document text
    • https://javubabajekav.weebly.com/uploads/1/3/5/9/135957287/8033969.pdfIn PDF document text
    • https://cdn.sqhk.co/zibavuna/iFjaSF9/black_beauty_1994_trailer.pdfIn PDF document text
    • http://wavarev.22web.org/jalikodabelopinotetuxube.pdfIn PDF document text
    • https://tubababekegoso.weebly.com/uploads/1/3/4/8/134880125/wozijabipo.pdfIn PDF document text
    • http://avit0.pro/ranuxixi03b4.pdfIn PDF document text
    • http://worldworkbook.com/191565179924bg9e.pdfIn PDF document text
    • https://cdn.sqhk.co/vefasebo/NjghiNI/fonavawuwifof.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/pinabe.pdfIn PDF document text
    • http://dotenuvofatawe.iblogger.org/saurashtra_university_b._com_sem_3_books.pdfIn PDF document text
    • https://cdn.sqhk.co/fonowatusopu/hyWRjdM/xeloboviwolipejuvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/punibagebo.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/journey_to_the_center_of_the_earth_2_full_movie_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/game_night_vietsub.pdfIn PDF document text
    • http://bemuvubovewe.epizy.com/elements_compounds_and_mixtures_worksheet_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/25371144067.pdfIn PDF document text
    • http://dijaxiletofevep.epizy.com/33830623457.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 5108 bytes
SHA-256: 8e69488384897e37b5462595d801b3e86d0b4839fbe6608ac69ccc44e78d9f2c
font_01_sfnt_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 11968 bytes
SHA-256: acc1e7ca750a1d89357a7a38cc746eda7bcf0dad05429884fff7e07f4d30826d
font_02_sfnt_off000120b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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