Malicious PDF — malware analysis report

Static analysis result for SHA-256 b127c9be2ce14a7b…

MALICIOUS

PDF

77.9 KB Created: 2021-02-22 14:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d2120546ff963da2431400913a3bbc86 SHA-1: 45d3d52a3c81c50a13aa034a5a4c0080a9cdefcd SHA-256: b127c9be2ce14a7b8b408c0e28a588da05f8d77a5b7e1396214fcf82a17a4851
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a characteristic of link farms used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a secondary payload.

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://druttle.ru/strik?utm_term=best+captivating+books PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470836/normal_5ffcb540491f0.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/eAiaWgd/xovosuvupe.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/U9jhV4B/good_slicer_make_the_perfect_fruit_juicery.pdfIn PDF document text
    • http://sipebep.22web.org/android_wireless_file_transfer_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/razotefo/jhedghk/kegupinal.pdfIn PDF document text
    • https://cdn.sqhk.co/ripudilibizo/zgi7icH/94571358567.pdfIn PDF document text
    • https://cdn.sqhk.co/zapusukajev/Qel8idO/my_boy_emulator_pokemon_yellow_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/dark_souls_remastered_builds_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/compliance_form_sample.pdfIn PDF document text
    • http://sulezunabifop.epizy.com/17928771333.pdfIn PDF document text
    • http://gemebewi.rf.gd/donok.pdfIn PDF document text
    • http://vejesigivilowen.rf.gd/55253114665.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/deere_and_company_annual_report_2017.pdfIn PDF document text
    • http://xitirinajeki.epizy.com/platform_number_2_video_song.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 2900 bytes
SHA-256: 9c84aca5171cf4522e1fd23f3e5391e17c8e645cdcb740b4c3036af6865bd014
font_01_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 5288 bytes
SHA-256: 5466d899b87f79bb5420557ab2082af3a82bb489f195b6b41fdf62339cf6d093
font_02_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 10708 bytes
SHA-256: 4805f371432777b199929db9df0f3a1f06393aefaf01d94c91011e02554a010b

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