Malicious PDF — malware analysis report

Static analysis result for SHA-256 171e4b574037419c…

MALICIOUS

PDF

72.3 KB Created: 2021-03-05 23:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e2f4b4a357685db602e84df09f682f73 SHA-1: 0d7a118f62977da7bb5797a93b01496de946509c SHA-256: 171e4b574037419ccdd489279f3eea20042cdf9eb445a338786dc0c46e1b6954
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wb?keyword=directv%204k%20genie%20mini%20receiver%20c61k PDF link annotation
    • http://workmonster.net/rufujoduxam9anbb.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/jafhehc/prison_break_season_5_netflix_australia_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/iHfeM0c/climbing_trail_running_shoes_for_wide_feet.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetozativ/FnihhcU/alone_quotes_in_english_short.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/ias2IKx/netaluzal.pdfIn PDF document text
    • https://cdn.sqhk.co/gibewuzavi/s9gggZR/h_band_app_login.pdfIn PDF document text
    • http://damita.fun/24684178609loeye.pdfIn PDF document text
    • https://cdn.sqhk.co/bibunifez/08YJHgh/38002870008.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/fozofulegapifovobabe.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/26f9a57d-3008-4ff9-9097-80ddd7381967/interior_design_schools_in_los_angeles_ca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a25395-8e22-4c43-a797-3060a478b3b6/louis_lamours_best_book_to_start.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_6eeda1f6dd5a420db7a97e76397c053c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff96343-02b6-40a5-8143-05bdfded4dfe/jaboxenogajux.pdfIn PDF document text
    • http://tofujuwo.onlinewebshop.net/magic_bullet_mb1001_replacement_blade.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_3ee96f8a6ae44dcb9086d011c2cd4f24.pdf?index=trueIn 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_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 5116 bytes
SHA-256: 09ff404a91e8697fd1cc1a4a2766def68975a5eecb63973a5f4f802ba22671a2
font_01_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 10056 bytes
SHA-256: 238a2dcd4adad3d1ce58c93420969e4297fc7c7f904101a7b533b581b702f360

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