Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a8522bd708ab34…

MALICIOUS

PDF

68.8 KB Created: 2021-03-16 08:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 23abf86766d69976f68d6293f1a2b86f SHA-1: 1aba4cf94964fa789a3e4233a00c5ae881bb9826 SHA-256: a1a8522bd708ab3445ee922f4de4dbcee00182f7db824b80a24b90923191d29b
126 Risk Score

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://bologen.ru/123?utm_term=cazadores+de+sombras+renacimiento+1+pdf PDF link annotation
    • http://xrootunited.com/51683903713vxoe2.pdfIn PDF document text
    • https://sarerudaguf.weebly.com/uploads/1/3/4/3/134373173/7a10c2bd8afbbc.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/26783317813azb2t.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/jfjihiZ/auto_photo_background_changer_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bidamasegom/hhhjjhc/star_defender_pc_games_free_download.pdfIn PDF document text
    • http://rmk4sale.xyz/android_x86_vmware_workstation_12squwl.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/dizikesilarew.pdfIn PDF document text
    • http://onlinetiser.website/zenwise_digestive_enzymes_walmartpwl9r.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/5cd32.pdfIn PDF document text
    • http://gekorepakeje.iblogger.org/65555686560.pdfIn PDF document text
    • http://visemomasa.66ghz.com/geometry_inscribed_angles_and_arcs_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/RJhZhbu/god_s_country_ringtone_free_download.pdfIn PDF document text
    • http://igclienteam.com/jurepu9j50k.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/aZAKhcg/my_boy_gba_emulator_apkpure.pdfIn PDF document text
    • http://fixmarker.fun/nokitufopelutf0tdv.pdfIn PDF document text
    • http://trysalon.xyz/harley_davidson_evolution_engine_diagram2j12x.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/iggjih0/alina_baraz_urban_flora_ep.pdfIn PDF document text
    • http://classkaod.ru/66330182678cls1m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refuzopil.epizy.com/baasha_full_movie_in_telugu_hd.pdfIn PDF document text
    • http://wowadowir.epizy.com/zilirek.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_off0000ce3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3D 5416 bytes
SHA-256: 372c5569c469ad1e46c922f2e44c6d3a9b5052e9ce65c870fe8acef618e69f5b
font_01_sfnt_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 11532 bytes
SHA-256: 177cd697a900183750d4c0295fa2d6e1d4f0de84065766be14ca140b6ef452e0