Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12a8a1f39a23017…

MALICIOUS

PDF

76.5 KB Created: 2021-03-20 14:32:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 41a1860484c2fa4eb461930e72b42ca6 SHA-1: 53d0f9543a59467ed115685e9ab39b68617cbb74 SHA-256: a12a8a1f39a2301784b79a4824c49c494b78cd09cb2817baa599e1ace0ce619e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/award?keyword=achilles+stretches+pdf PDF link annotation
    • http://negozio50sconto.info/779877227726e9rl.pdfIn PDF document text
    • http://manybigs.space/mebixagaxiwikod7t7w8.pdfIn PDF document text
    • http://instapriz24.online/tractor_pulling_calendar_2020qwq5s.pdfIn PDF document text
    • https://safupoxex.weebly.com/uploads/1/3/2/6/132683070/tuxedodevoxori-kibitiveb.pdfIn PDF document text
    • http://nigodofifulo.scienceontheweb.net/easy_classical_guitar_songs_for_beginners.pdfIn PDF document text
    • https://kedabivaj.weebly.com/uploads/1/3/1/4/131438143/diwisenep.pdfIn PDF document text
    • https://bewotababuruga.weebly.com/uploads/1/3/1/1/131163836/bc7ff79.pdfIn PDF document text
    • http://pedron.fun/audiolibro_el_amante_japonesxb7el.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/f7ebe92d-0b47-4756-9d63-fa75e5607d01/logic_pro_x_macbook_air_2015.pdfIn PDF document text
    • http://mojogoralil.onlinewebshop.net/endocrine_system_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/jean_baptiste_say_livros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7fa047e-88c5-411d-9e1b-0d5f08fce2fe/84759786918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1742711a-ee2a-4b42-9b7a-97e9b7256355/31279061064.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/academic_achievement_research.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/teri_call_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d65d2f74-64ae-4852-9c52-3c87e3a4e0fd/android_app_development_course_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/781fb463-cf9d-45c8-905b-f91aae6d95fe/how_to_find_a_german_shepherd_breeder.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/forklift_license_training_near_me.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_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 5024 bytes
SHA-256: a7f32c9b5a6d7bf17fc6c4b1cd146f3f07567e41215ca7203e73795f76473833
font_01_sfnt_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 10568 bytes
SHA-256: b400779c6a65edc2fec21ced409801423f87e690e53ad18348fac629ea5936ae

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