Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa8b7683dc9e0d6…

MALICIOUS

PDF

89.8 KB Created: 2021-03-15 10:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 8f7d497b42e2a138e9a23689c6bd9fe6 SHA-1: c64f46e6516ddbceb0086e7ae526555424060821 SHA-256: 7fa8b7683dc9e0d6b450e6ec90feff65d31f7d65637970ef17e11ca5f13bcdf0
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to `https://seumenha.ru/123?utm_term=wpf+listbox+different+data+templates`, suggesting a phishing or redirection scheme. The PDF's structure and the presence of external links are consistent with a spearphishing attachment used to direct users to potentially harmful content.

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://seumenha.ru/123?utm_term=wpf+listbox+different+data+templates PDF link annotation
    • https://cdn.sqhk.co/bimolixumotu/hb7Ojhj/fashion_plates_toy.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/pVjhV74/peony_nail_spa_maple_grove_mn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5fdc0629d48fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497131/normal_5fd136ffb3ed8.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxinugad/cPTeBP4/car_plate_number_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5fdf5992a1611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jusexezoti.epizy.com/94490427223.pdfIn PDF document text
    • http://wawavubuwile.rf.gd/glass_blowing_osrs_guide.pdfIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_0cc64982001349b485e57d0ac1bf9f12.pdf?index=trueIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_8bd3b62730444036bda9519f0d10ce88.pdf?index=trueIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_f832817e93a2429f9a189db9d363aa88.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1005f341-64b1-4b44-94d5-a085be43cbfc/68544180521.pdfIn PDF document text
    • http://kuxixatizoxop.epizy.com/fly_by_night_drum_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b77500-7a66-4b1d-8e6f-ac73af682c89/pozigegofeziro.pdfIn PDF document text
    • http://tewapodu.rf.gd/zuvujososixujun.pdfIn PDF document text
    • http://tepokubomime.rf.gd/bukosudukuroluk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8395722-5bc2-46aa-9d69-349333d4a167/probabilidad_y_estadistica_para_bachillerato.pdfIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_18810baeafe44eeb992bfbac8804986f.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_eda06f655c0948ca9d2c8a080f6ae59a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fbb0f71-22ea-44ad-ba48-657425eb35cb/best_books_to_learn_r_programming_language.pdfIn PDF document text
    • http://dijuruxowasi.epizy.com/76391708974.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_off00011fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 5408 bytes
SHA-256: 25ec1ee68a7dcdd849c2c05f517c04e08d1ed0438c076f45fa8ce4adf054c224
font_01_sfnt_off00013201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13201 11920 bytes
SHA-256: 51ed7215207548b79e5767443e978444b779a1684c11cc730595aff4b54d4be1

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