Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef4da70c1ba3584…

MALICIOUS

PDF

76.5 KB Created: 2021-01-25 12:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f73a55b0679c8592b3e49beaab846946 SHA-1: 01ecf4538829cc71c63f24fad8eca7b610890b12 SHA-256: 1ef4da70c1ba3584713ea11190058950cd23ea69039e863a7e4d65d7939a1cb3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to 'Honda fury review' and 'wkhtmltopdf', which may be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=honda+fury+review PDF link annotation
    • http://copyright-central-media.com/roblox_s1_filingmuww3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368777/normal_5fefb44feec4c.pdfIn PDF document text
    • http://idealica-itufficiale.website/barbie_dreamhouse_adventures_dolls_amazonl4y1c.pdfIn PDF document text
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/86c21.pdfIn PDF document text
    • http://nikecortez.net/59447906372qx6c.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/gewum-dixofepofi-sazave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_5fdc32890c4e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446027/normal_5fca290500c4e.pdfIn PDF document text
    • http://opssmall.space/pejulapubwnqu.pdfIn PDF document text
    • http://f13x.xyz/game_dev_story_hardware_engineer_hiren5avf.pdfIn PDF document text
    • http://zhigina.ru/cartoon_sounds_in_wordsjnij2.pdfIn PDF document text
    • https://wabaxudazisivi.weebly.com/uploads/1/3/3/9/133986682/f3ab7847dcb9.pdfIn PDF document text
    • http://dorightschool.com/lexewitwm9gg.pdfIn PDF document text
    • http://mavitrade.com/electric_toy_trains_for_toddlers15d10.pdfIn PDF document text
    • http://tikovg.xyz/top_battle_tanks_2020ddbu6.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/castles_of_burgundy_board_game_rulesqsd7l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_5fe744f86a401.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 4708 bytes
SHA-256: 9dc0569579f56fbd105e8a884e40638f1fdc87a7ec8f155f35c35327dbe3ca80
font_01_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 11008 bytes
SHA-256: 3c827728f418f0c52142c20167f37896e62ee134def585ee75ab21fb52516720
font_02_sfnt_off000116d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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