Malicious PDF — malware analysis report

Static analysis result for SHA-256 73be5cecc6879aa7…

MALICIOUS

PDF

92.3 KB Created: 2021-02-28 15:16:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fd3f39acfc3a19b5077eec3e103f9d29 SHA-1: a6a7eb28d67f1e3fedaeecc0e0d13e187765f5c8 SHA-256: 73be5cecc6879aa788bee36f3da647e01b69314e286a5a636a03134a7e239067
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the presence of external URIs points to a potential initial access vector via spearphishing attachment.

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://maypoin.ru/strik?utm_term=atmos+clock+parts+diagram PDF link annotation
    • http://startbastar.online/fapusopedoxas6xi3.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/jcHitsK/the_farmhouse_menu_delavan_il.pdfIn PDF document text
    • https://cdn.sqhk.co/bedipidis/hed5qhf/bokanojuposamig.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/54859491116.pdfIn PDF document text
    • http://o-karte-kopilka.com/79284846074z4tup.pdfIn PDF document text
    • http://pewujok.mypressonline.com/al_fajr_watch_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/dicjdPU/usaf_simulators_division.pdfIn PDF document text
    • https://cdn.sqhk.co/xumifutave/bTigOPh/61479186896.pdfIn PDF document text
    • http://skidki-day.shop/best_american_ninja_warrior_runskhq0l.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/cWggPgf/hangman_movie_ending_word.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/Ojbhfhc/medikalijij.pdfIn PDF document text
    • https://cdn.sqhk.co/kokedipemi/gcFkvha/exit_managed_home_screen.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/l0GjfJC/buzononuweperaburorepopis.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/picijdu/used_car_price_estimator_usa.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/graphic_designer_job_indeed_pampanga.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/dBhirgc/fodijedi.pdfIn PDF document text
    • http://sunshop.pro/nivuvunamadero0l69m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/xosexajoropidifubafiwur.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001425a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1425A 19864 bytes
SHA-256: c434f06d61495bfe125b6f78f7908908f924bd77e864efeec7ddd72fdf2d38ec
font_00_sfnt_off000107d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 5448 bytes
SHA-256: d7ff65cf837763a99d31de6896a4dcb5f15eac8b43226e47671ac6bbbfc88ab5
font_01_sfnt_off00011a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A46 12084 bytes
SHA-256: 6c8b1b6cae97e97898ec673bfd9b15105800db6251e7924f03c1fdd406ded45f

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