Malicious PDF — malware analysis report

Static analysis result for SHA-256 3941335fda74a8a7…

MALICIOUS

PDF

77.3 KB Created: 2021-03-23 17:56:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5f1f631018a92b098ecd11d8da8e327c SHA-1: 1315939663d75e7012c4a319b0210f90c5a8690f SHA-256: 3941335fda74a8a77e50f62539f3632a3214786807193c1934abd8ea212a6473
186 Risk Score

Malware Insights

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

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 0.9991

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/award?keyword=power+amplifier+schematic+diagram.+pdf PDF link annotation
    • https://nupigefaxobabu.weebly.com/uploads/1/3/1/0/131070289/b5d5e98720f28.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/Mihhdge/rainbow_to_do_lists_tasks_reminders_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/OHiMXja/81415255486.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/cgeJkie/toddler_swallowed_bouncy_ball.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/S7Z60Nn/hepatitis_alcohol_symptoms.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopijaku/jdLRVka/zesopa.pdfIn PDF document text
    • https://lorinifufa.weebly.com/uploads/1/3/4/3/134357706/3180247.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/gf6yhjH/winter_warmer_harpoon.pdfIn PDF document text
    • http://makeyourself.xyz/6998606129899udp.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/dijexeselijowisp1mss.pdfIn PDF document text
    • http://eslivdrug.space/uber_case_study_marketingsssf5.pdfIn PDF document text
    • https://kagarowili.weebly.com/uploads/1/3/1/0/131070488/bejotofixidal_mumonuxogijet_vesexejij_davaxur.pdfIn PDF document text
    • http://honey-love.ru/into_the_abyss_song_suranx8gqo.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/YjbqQie/concise_physics_class_9_icse_solutions_chapter_1.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/stillwater_ok_drivers_license_renewal9pcjh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lonelogu.epizy.com/finding_slope_from_an_equation_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0f21df2-ec4d-46ba-a1b8-1a6decc4797a/55905600615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642390bd-90a8-474e-9ae4-2ca7f6fa8102/nizejowalenexaregizefofid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf9b7ce-1735-47b6-b2de-c378a6f94372/leripoxebugamokubugituje.pdfIn PDF document text
    • http://tavafusekexof.rf.gd/52343617290.pdfIn PDF document text
    • http://kunerev.epizy.com/pusoxovunukikuxoromesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec409138-a66c-400d-9827-a8fa2b2139f3/78639103122.pdfIn PDF document text
    • http://zadegijug.epizy.com/lijukeda.pdfIn PDF document text
    • http://kelawezup.rf.gd/anjali_movie_in_tamilrockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff76b04-6f0a-4287-906b-2d05839762c4/zivopizuwikadin.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 5692 bytes
SHA-256: a5ae69c7d9850b0c554c71912f318b2e3d343b4c0135bdcd5ba7876e3152cfa1
font_01_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 10636 bytes
SHA-256: cd518bc7bf8a2312f76f999c5fb662fe4c39ff7832801628a99d7161c5ac5cd6