Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61861ee8e9951f6…

MALICIOUS

PDF

80.9 KB Created: 2021-02-13 14:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ee6b930fe501cdc1081eabad896a2228 SHA-1: 0204ee7d28e5f635c9cdb78a36d90a7715014669 SHA-256: b61861ee8e9951f65c691bfc93722e302c98c664a5f1f8dcff6aab0ed396ada7
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=recursos+claves+del+modelo+canvas In PDF document text
    • https://cdn-cms.f-static.net/uploads/4460057/normal_5fd9bd47b590d.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/i1gjaUl/chain_strike_wikia.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/2jchejc/download_game_sea_monster_city_mod.pdfIn PDF document text
    • http://todayit.pro/chevrolet_cruze_2015_user_manualza8ka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5ff7f82a1a0c0.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/CgfIggc/jekivusixazapopitef.pdfIn PDF document text
    • http://geosen.net/42826079092eo8j7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450731/normal_5fd2f5d90b6bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5fc9557a165b9.pdfIn PDF document text
    • http://chategratis.online/wordpress_html_templates_free_with_css387j4.pdfIn PDF document text
    • https://cdn.sqhk.co/kubasovusi/R7jjjbk/carpenter_wood_cutting_tools.pdfIn PDF document text
    • http://fridgeservice.ru/romezivetumushcu7w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446914/normal_5fdc39391ca37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450506/normal_5fee650ccb0b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_6025ebd499381.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
    • https://s3.amazonaws.com/gazijewevan/akuntansi_keuangan_1.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/narukoxute.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 4904 bytes
SHA-256: dd82dc0fbe7eee5c6cb9597e63e35b872afa5323fe6ec769026c1fa31994f44f
font_01_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 2116 bytes
SHA-256: 8db65adc699bed2ed4e99b174e414cace916d9ae25f4e5597e3d94de4d1667c8
font_02_sfnt_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 11536 bytes
SHA-256: e22225dc082374412786327cab2cd366b6f0eedf720ad0f37b120e7ec4783b55
font_03_sfnt_off0001267d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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