Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e51e570fd43e69…

MALICIOUS

PDF

72.3 KB Created: 2021-03-13 21:16:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8257d75de5c8856ee28b3595650d423d SHA-1: 33c0b4504987ff272ee23c14e86604163625eb5b SHA-256: f5e51e570fd43e69aeba2c4738a610f5cff547574557ba025952336dc9754691
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with a significant number pointing to potentially malicious domains, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect the user to malicious content. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to exploit vulnerabilities or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://midufefew.ru/wix?keyword=colonial+adventure+tours+case+answers+chapter+3 PDF link annotation
    • http://zumbayuliya.online/digivibwnhvh.pdfIn PDF document text
    • http://olivamebel.com/arabic_dictionary_englishubjah.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/673259.pdfIn PDF document text
    • http://lifeshop.pro/2017_chevrolet_malibu_premier_owners_manual4xlnd.pdfIn PDF document text
    • http://vekvelo.ru/wetumkbpgw.pdfIn PDF document text
    • http://5coupon.info/tcp_ip_reference_model_in_computer_networks_ppthocus.pdfIn PDF document text
    • http://dresdenpharma.ru/95423645303xu8fj.pdfIn PDF document text
    • http://euroshopmn.space/tozumavukupisaxs07u.pdfIn PDF document text
    • http://itdomen.fun/wagijosujenudedufinawihob.pdfIn PDF document text
    • https://fipufiradak.weebly.com/uploads/1/3/0/8/130813779/39b831.pdfIn PDF document text
    • https://guxofavopadowan.weebly.com/uploads/1/3/5/9/135988616/sofomoki-kemilatuzo.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/webibetajeb.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/mufukep/procalcitonina_sepsis.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/fidikalalilitejusozokefi.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/perfect_english_grammar_past_simple_mixed_exercise.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/rakuwisokakejigobab.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/nexaregefigo.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/android_get_assets_dir.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/99286017314.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_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 5384 bytes
SHA-256: be179cb536ff9d3c0faebc275767b6db6bc91758446df1b19229f089595455e9
font_01_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 10596 bytes
SHA-256: d16c8fa3acab3cef1b8e2345043c95b26b7b23657b0da6326b817c31cbd08140

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