Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f2ecccaca7e569…

MALICIOUS

PDF

98.8 KB Created: 2021-05-17 07:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3791e2a40b6070e09cc09c6c1074efed SHA-1: 11c4cbf115548429b7c1cc05656b1c20cc53617f SHA-256: 59f2ecccaca7e5690a8a009776976143a222340f25ab8ad330aa2de72e86571e
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=daily+language+review+grade+6+answer+key+week+14 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377120/normal_5ff104542dd3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393916/normal_605421dcd7bbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500878/normal_60447605c5bbd.pdfIn PDF document text
    • https://karimimeri.weebly.com/uploads/1/3/1/1/131164281/tiwoj_fewimotibim.pdfIn PDF document text
    • http://fridgeservice.ru/percy_jackson_and_the_olympians_book_set_hardcoverkff4a.pdfIn PDF document text
    • https://doxorovovo.weebly.com/uploads/1/3/4/4/134479089/gerodosuba.pdfIn PDF document text
    • https://lejumapufa.weebly.com/uploads/1/3/4/6/134688193/zusivunev_pivazomaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451210/normal_5fded83825704.pdfIn PDF document text
    • http://doweryklkq.space/tomenunumobewqbzgb.pdfIn PDF document text
    • http://photoforce.ru/dialysis_treatment_guidelinesrp9qq.pdfIn PDF document text
    • https://jexopagovijum.weebly.com/uploads/1/3/7/5/137518486/rexawediwo.pdfIn PDF document text
    • http://clubstore.pro/73948597612agvjr.pdfIn PDF document text
    • http://air-calm2.club/rusopozinoxodujera2c10b.pdfIn PDF document text
    • http://hiziryigit.online/40119595237968a3.pdfIn PDF document text
    • http://mnclassis.org/512840790233mjlx.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/5280147e-79ac-408e-ac92-8d7e17c6fb79/zokoj.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/talaresusitubapig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a501e5-8dc9-4dfe-9def-e4f0f89a1b4c/nezigujubulegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e209b8a-8f6b-4f5b-9870-a439a1663e6a/gunazusegow.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/how_to_sync_summer_baby_monitor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea9cc33-a71a-43c9-b87e-d06409447de9/what_are_all_the_rappers_that_died_in_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/song_lyrics_here_i_am_lord_arms_wide_open.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d5115c0-930e-4c53-8592-073a5fb7bef8/animal_farm_chapter_1_questions.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_off00013ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDF 5604 bytes
SHA-256: 3743d3ca00e7c75d6fdd012781fadf1d5429d9981b67e27116507552c27ec200
font_01_sfnt_off00015136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15136 13124 bytes
SHA-256: 09b6b3bee795dab556710308a06f4d216f5d13030e04c2b6acc2ad9764511fdc

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