Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f14bbefb6fa0f5…

MALICIOUS

PDF

78.5 KB Created: 2021-05-15 01:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff197e1353c72abbe871b6b2cf50b8dc SHA-1: af0d06173bc689a078f3d6a65575558341eb0e5d SHA-256: c1f14bbefb6fa0f51d2e6c9bdb983a2b0651ea75384ca780f15f2b44d9ba5a81
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-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.
  • 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://mezovuduw.ru/strik?utm_term=why+does+my+samsung+dryer+says+check+filter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413707/normal_6052af9f64c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383918/normal_604db7b967696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457861/normal_6040d689c769a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387240/normal_5fe31c3b28cb3.pdfIn PDF document text
    • https://cdn.sqhk.co/wejideduv/ggigjgA/plasma_live_wallpaper_iphone_xr.pdfIn PDF document text
    • http://viwafuxofiseko.getenjoyment.net/antrenmanlarla_geometri_2._kitap.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/anestesia_general.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/damujojot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_5fd6ac06c4b89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_60546ff640b42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484632/normal_6045f95c9d5cf.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/hiidSm6/skywars_map_minecraft_mini_game.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/heNKhgP/pizovamafuxutu.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/8eba80cb-62f2-4fad-b370-2d85971278ba/alexander_dale_oen_death_cause.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/wigum.pdfIn PDF document text
    • http://vidilig.onlinewebshop.net/23705124281.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/90093839267.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/sinovibiboso.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/happy_birthday_sheetal_name_image.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c25c5b-d85d-46c4-9aa5-d0f081623632/pepolexa.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_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 5616 bytes
SHA-256: a57e35895d0f6ad705a399cc974825f59e0b730d5d04bc775b2e8c81b31ab03a
font_01_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 11360 bytes
SHA-256: 7689a258e045c413a1da95badc14ea8bdbb45bbe09bf6d5df76a54f5811a4883

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