Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cef73ba9596a4c…

MALICIOUS

PDF

91.7 KB Created: 2021-03-26 03:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8ca6e4060d48f704d0bf8579cd6737ad SHA-1: 5b29de9903f3ee5c8d1b1435295f3223dc6514a0 SHA-256: 37cef73ba9596a4c89c582f28ba0610ad009caa0752c65de1cc3329f47b25724
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://zajinet.ru/award?keyword=endocervicitis+cronica+tratamiento+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408712/normal_604aa6d937213.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413244/normal_5ff7a15fb9d22.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/70832616153.pdfIn PDF document text
    • http://xexejevun.medianewsonline.com/water_pollution_causes_and_prevention.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484370/normal_5fcf6d837de3b.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/a_series_of_unfortunate_events_the_reptile_room_book.pdfIn PDF document text
    • http://tobaliwono.mygamesonline.org/3036832015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5feff2971677a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427274/normal_5fc7a231b022f.pdfIn PDF document text
    • http://pusovemolexed.scienceontheweb.net/36752723681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_605d213719293.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/a5402ad0-3089-4562-9c5c-e63ae4df9675/prologo_el_reino_de_este_mundo_analisis.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/what_is_the_meaning_of_god_the_holy_spirit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4138a43-9e61-4867-8b5c-73ca4de76880/vafisajifuruvuwugolurakog.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/57020056453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fddbf20-97db-49d9-8319-eac5251f5bcd/data_science_and_analytics_course_in_bangalore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e20cc0-346e-40cd-b344-eae3199ce2f2/interior_design_colours_for_2020_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/biniwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67aa1e51-a2f0-47b6-8b48-5e31d4b25c36/wazotemufozetisamobuk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 5284 bytes
SHA-256: e340c5210962d3a98206c97454c04398f9fe3fac4d3947aa09c559a0f3474688
font_01_sfnt_off00012d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2B 16852 bytes
SHA-256: 3f185663aad6a6512ac20598a196ac7abcc37c3ee4512bb2bc38dbf941638259

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