Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd80e93b14e93c60…

MALICIOUS

PDF

78.2 KB Created: 2021-03-26 07:33:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8f343ee8b3e6102ebb68bf2ea0810db9 SHA-1: 58f1a5c7071badbad2ebc8a71c1b45e02aecc56f SHA-256: fd80e93b14e93c60bb3388bdfaa1a05ac213adf2d4ceeaf37467414ec6289dcd
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=medical+microbiology+textbook+free+pdf PDF link annotation
    • https://cdn.sqhk.co/kekelivig/UE1ggjf/teachers_unions_covid_ontario.pdfIn PDF document text
    • https://cdn.sqhk.co/gowozepugax/jiM74jf/59960449867.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/63a127.pdfIn PDF document text
    • https://cdn.sqhk.co/fitijusepako/jghgxjc/puruzud.pdfIn PDF document text
    • http://dabosesavedevet.medianewsonline.com/active_causative_exercises.pdfIn PDF document text
    • http://sudilufib.getenjoyment.net/allahabad_state_university_b_ed_syllabus_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/RhiGgjC/felubagavudiken.pdfIn PDF document text
    • https://fifimijo.weebly.com/uploads/1/3/4/7/134748793/tekosopovuzeji.pdfIn PDF document text
    • https://kogezuzoxato.weebly.com/uploads/1/3/1/0/131070880/7126036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451019/normal_605429ff8889d.pdfIn PDF document text
    • https://jerofewu.weebly.com/uploads/1/3/4/3/134369167/bc7c08da75b.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/53711663483.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379476/normal_5fc62bdbc0eca.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/ig7widE/weekend_update_saturday_night_live_november_7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464852/normal_602480486de72.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/a14a702a-51cd-4558-b0f4-cd1deea27a6d/us_air_force_rank_badges.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/4553723703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ba4f8f-70c4-4fdc-8efe-feedc5ecaac9/dbt_training_2020_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c530062f-5d0f-4039-9571-a15d1e6d15c0/30780814586.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/yamaha_mixer_mg10xu_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/ascii_table_in_java.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_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 5676 bytes
SHA-256: 3f1475b2a4a14514913738afa1f2e2b6fefd59105666968930aec346fb56f892
font_01_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 11220 bytes
SHA-256: 837fc0090badfdaf9e93d14d94a0bd8a83f8f7d80bee7ab1addb749199238e77

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