Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfb0b09285149f7…

MALICIOUS

PDF

81.6 KB Created: 2021-03-17 19:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 17d9eaa7acf90f128219a387b99b9ee5 SHA-1: 25f0bad13d85519f06a8c25d094d5222a7bfe321 SHA-256: 6cfb0b09285149f764938760c665db144dc2c621ed7407283d517c4ea0465211
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 high-confidence ML classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of external URIs and the ML classification strongly suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=cycleops+fluid+2+manual+pdf PDF link annotation
    • https://kofavuzaxo.weebly.com/uploads/1/3/0/8/130873868/xotobunefabifepoda.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/jMjdDhf/ahly_vs_zamalek_live_today.pdfIn PDF document text
    • https://xoxekoxezugox.weebly.com/uploads/1/3/0/7/130738790/e147957971dffc2.pdfIn PDF document text
    • https://cdn.sqhk.co/ridefapagol/cqTtKEx/pulse_secure_not_connecting_host_not_found.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366362/normal_5fc995b841951.pdfIn PDF document text
    • http://zilixijabukepul.iblogger.org/51575180760.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/Ehcgfja/the_scary_teacher_granny_branny_survival_mods.pdfIn PDF document text
    • https://lurukise.weebly.com/uploads/1/3/4/4/134454795/waxerepim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_604b2d0826fd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454280/normal_5ffd299200cf0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385617/normal_5ff98e78ca1d0.pdfIn PDF document text
    • https://cdn.sqhk.co/mezadisedud/h7kgknY/top_chemical_engineering_colleges_in_tamilnadu.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/Pjdugg5/gun_builder_2_unblocked.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/fajixe/nuzumedusimexekemede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ae9473-5299-4399-87d1-cc0c19fe67e5/67260711048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430280d6-b472-4adb-b4cd-5bf23946a48f/navy_jobs_2020_advertisement.pdfIn PDF document text
    • http://zemigubu.epizy.com/lotofiji.pdfIn PDF document text
    • http://vefogisoj.epizy.com/19360471342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dec93019-0ae6-46cb-9db4-40467ba0c1d1/rosetta_stone_faq.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/govifunajoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df42c42b-5cda-4ed1-b15c-a6766da226b9/mudegeturixo.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_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 5264 bytes
SHA-256: cd5a1a1d367d38b7aace3a4d21e03e8a95343a1b7c3dfe6f9aa48d0bde9f437f
font_01_sfnt_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 11844 bytes
SHA-256: 89a10fa1566fde98982bcc13f051de2380b84d391270366bf10810621a05a066
font_02_sfnt_off00012a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A70 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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