Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b0363b33048d7a…

MALICIOUS

PDF

81.0 KB Created: 2021-03-17 08:34:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2e0d007d288a5e141371401d77f2b7c6 SHA-1: 660eddefa863cf1d89717c836fa23b287c63312e SHA-256: c7b0363b33048d7a3de1b8c2a1bcc35c630205b8c392385f79a9450e718e19ae
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to software cracks, and a heuristic indicates it's a social-engineering attempt to trick users into installing browser extensions or updates. This points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://crophysi.ru/123?utm_term=corel+draw+x4+crack++free In PDF document text
    • https://cdn.sqhk.co/numanazolov/0jbNd6c/open_laparotomy_and_bowel_resection.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/Q4Nhj0P/kixuxelagiwulaw.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/geumpjf/6523289434.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/Y3HrQ1i/86608041203.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462351/normal_5fd05e694cd10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425760/normal_604dd6e6e3884.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/ibifw3z/capital_turnover_formula_managerial_accounting.pdfIn PDF document text
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/vatodosike.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_6009508712133.pdfIn PDF document text
    • https://sapuzexa.weebly.com/uploads/1/3/5/3/135348006/serikoruj.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/4c5d6ec8-d59d-49a0-92b5-1bccf2f47ed7/how_bad_can_i_be_spanish_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/anandi_gopal_marathi_movie_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/62920605125.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/android_video_player_activity_example.pdfIn PDF document text
    • http://ralabok.epizy.com/81200725360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424c2abe-8fec-4c85-b077-42df9cbf85c7/55805916276.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/linelaneposezejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e275847-3649-4f4d-9966-456a415cccbd/how_to_prepare_for_business_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca00c095-8bd9-46e9-aeb1-074d0cb68ea5/cambridge_phrasal_verbs_dictionary_drive.pdfIn PDF document text
    • http://dizoleline.epizy.com/binomial_distribution_python.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3f809cf-4427-44d5-aebf-28ef0ea1b887/why_is_the_light_on_my_harmony_hub_red.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_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 5052 bytes
SHA-256: df6be1bfb565479992c1db68c57da340a4b32134c1c4019894fc118967259a49
font_01_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 11288 bytes
SHA-256: 534e76d1836c885b648efb45f411c399471acd408104b071d3a78c45d8f0414b

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