Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ff6264ecabc1cb…

MALICIOUS

PDF

77.7 KB Created: 2021-04-11 09:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: af00e9465ff1eff9603cd749a5bfe7fa SHA-1: cc6abb78bb1e882cb914bcd9072ee135bd91ea1c SHA-256: 49ff6264ecabc1cb6cc2e7c2075dd4aa953f1c691775f84e1c40b375692c3026
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL that redirects to a disposable hosting service, likely to host malicious content or facilitate further infection. The document body, though heavily obfuscated, suggests a lure related to 'advanced business english lessons'.

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://jumiwimov.ru/strik?utm_term=advanced+business+english+lessons+pdf PDF link annotation
    • http://mirror-x.org/hoover_steamvac_carpet_upholstery_detergentw9y5q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486778/normal_5fd19c7f14263.pdfIn PDF document text
    • https://wugovokida.weebly.com/uploads/1/3/4/3/134319073/e837f98db.pdfIn PDF document text
    • https://kopaluzakiletal.weebly.com/uploads/1/3/0/7/130739322/5450633.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/a3Bhdij/best_free_online_city_builder_games.pdfIn PDF document text
    • http://gufutaca1.xyz/top_interior_design_game_apps8zmh2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410988/normal_600534cd7e7c9.pdfIn PDF document text
    • http://pro-konditer.com/the_end_of_the_world_movier7d2s.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/dGXaq8O/zuxibuzerumenirikopanon.pdfIn PDF document text
    • http://anarchymedya.com/65010462742gj4ea.pdfIn PDF document text
    • https://cdn.sqhk.co/gajerivab/gffghhT/bud_farm_grass_roots_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac82461b-986b-47c8-a3c3-1e6d48556ec4/wofofojizomowugan.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/dobejudud.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/48432875398.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/vidmate_karne_ke_liye_tarika.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/how_to_change_oil_on_a_ariens_ikon_x_52.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0815b4d-e5fb-4df8-9acd-04f5e01ed43d/walmart_hours_tomorrow_memorial_day.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5089eba1-e258-40f5-95e1-e6157ae1a7c1/nixofijo.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/4992022469.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_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 5508 bytes
SHA-256: 079e5213afd8c69f3df762b67efadd9ee23541ed387e590b9e4a173ccfeb8217
font_01_sfnt_off00010473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10473 10848 bytes
SHA-256: afebe8db86f8016748c70b3cd00dbf96909fe4ccb2bffa503dc97ac2fca8a428

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