Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c21840e101ef2a8…

MALICIOUS

PDF

75.3 KB Created: 2021-03-11 13:09:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6b9063223563ccb709fc8e57b4399d8f SHA-1: 8299eb64fb68fb940b4c0934979666a70cf5bff8 SHA-256: 1c21840e101ef2a88a16f48715b9c6fb4935538ac25986205d39b620135ff482
126 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malicious distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to exercise equipment, designed to mask the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wb?keyword=how%20to%20use%20cardio%20glide%20exercise%20machine PDF link annotation
    • https://cdn.sqhk.co/votiwixuduzo/ieifhcL/stickman_street_fighting_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/banifiga/gfGiagi/16993640594.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/hVmNge3/34683752134.pdfIn PDF document text
    • http://lisifakus.66ghz.com/66199856393.pdfIn PDF document text
    • https://cdn.sqhk.co/dubagelojuwe/ahbiuoO/download_strike_back_elite_force_fps_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_2f61eb82c0aa4dc4be899cb0444e45e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pilazi/ronomosa.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_d101cdb0b2404db3bf770fff5d250b68.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_e9e535028a324751927aa6941a61732d.pdf?index=trueIn PDF document text
    • http://labopum.rf.gd/marathi_dj_song_2018_free.pdfIn PDF document text
    • http://lasakarafivof.epizy.com/21039444933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce1e131-3b02-4f7c-b7d5-44e322595de8/29205250995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76d49be-e293-4d94-ac46-4a044da0b8db/62892252567.pdfIn PDF document text
    • http://binasizula.rf.gd/capex_opex_project_management.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_875d9d00fda14a51afd8cfbca49e35e3.pdf?index=trueIn PDF document text
    • http://bixogonabu.epizy.com/monirovilepej.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/master_forge_bbq_website.pdfIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_d3eda386c9d04316ac4b05d86acb8bef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nalifij/30295854627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e24369b-3ba6-4b06-b2af-190dd2e63986/tiwubesaramumozaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f0c64b-68a2-491e-bdf0-0d2fd7ad5c31/32034635277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a13989a-5e57-4322-a836-6b368d2bc990/46778845342.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_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 5472 bytes
SHA-256: d5f2f67f5531ca4c59125e434e50afce3de6b048dac95219b7d69adeca9d7683
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 10112 bytes
SHA-256: ccc7f8f96f8b5a80ab787b0aa409b243b4b1e25406384bd277fc43a6433c97a0

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