Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b805190201819e…

MALICIOUS

PDF

42.3 KB Created: 2020-11-05 21:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 11195739b7246d66f8dd786bc8c44009 SHA-1: d9a54fb0a426e1632b38ae3fddb1d9353b54b24d SHA-256: 57b805190201819e32e58000ce2fc4f1b8d0c76ce6d11ca5d624090fe521529b
66 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 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 1.0000

Heuristics 4

  • 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://traffine.ru/strik?keyword=fall+2020+csun+start+date PDF link annotation
    • https://davobudo.weebly.com/uploads/1/3/4/4/134432622/lujaxosisedujimo.pdfIn PDF document text
    • https://juluvolalo.weebly.com/uploads/1/3/4/4/134435755/jebebizonoxuvozolak.pdfIn PDF document text
    • https://majubatu.weebly.com/uploads/1/3/4/2/134265851/rufusa_ludotivilefipux_tugejena_lesemig.pdfIn PDF document text
    • https://xekixudag.weebly.com/uploads/1/3/4/3/134336078/xakubipi-monidugana-nekegibakison-megegalopu.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kekikefuwu.pdfIn PDF document text
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/7ec7f1472609892.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/zubobaratezodojuleri.pdfIn PDF document text
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/7479641.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/vokeri/in_contrast_meaning_in_sinhala.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/37375476412.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/26815860988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75e45ea3-85fc-49ac-a236-f2a29e0cf48b/588806606.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/40467229907.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/borimatonikafuxuwururoki.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/psychoterapia_psychodynamiczna_zaburze_osobowoci_chomikuj.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_off000066be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66BE 5164 bytes
SHA-256: e791c804e2ef701bd59920bb05fb81888add8ce1365b6d075f6c65a4f99e2a96
font_01_sfnt_off00007858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7858 10572 bytes
SHA-256: d7e427cdec0d2806dd8b0329ffe0ec70f9cf9c0b0d5b2a048ab79150eb8537c2

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