Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d86d8c3aab8a19…

MALICIOUS

PDF

81.9 KB Created: 2021-03-24 16:03:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3209d373fdcca7caf49062465f88039f SHA-1: 9c45824e6d403b9ceb27dd5c5c402e09d07ccded SHA-256: d7d86d8c3aab8a19d81f9007a92020d938094688842cf694397218aaf7e9f13b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's used to distribute malware or conduct phishing by directing users to compromised or malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/award?keyword=avengers+infinity+war+part+2+comic+pdf PDF link annotation
    • https://cdn.sqhk.co/wowasuperan/Xjd0Hje/student_work_experience_report_example.pdfIn PDF document text
    • https://cdn.sqhk.co/gojelonub/U7HoZjg/find_switch_bluetooth_mac_address.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/ibNmgeF/podcast_player_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gimowiboxero/WXkhbDw/44979415507.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/iTaoFhf/fuxijikor.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/h1ijJhc/project_management_apps_for_small_teams.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/gibJhck/cabal_private_server_ph_free.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/IicBqU6/arduino_datasheet_circuit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jolavewavesuj.epizy.com/citizen_calculator_free_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/how_to_get_staples_rewards_number.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/bokelum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3e5e49-04f4-4b05-9068-e3bc59ebe3a2/naeyc_standards_for_initial_and_advanced_early_childhood_professional_preparation_programs.pdfIn PDF document text
    • http://nedajazamofo.epizy.com/odia_movie_blackmail_all_song_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a3935df-f6cd-4d7f-93b2-41e9548861c9/74866356785.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/xopapifimajegeviwebam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efde172c-b8a0-4e8b-a838-dac308be12be/magoosh_gre_verbal_practice_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8caa4aa-8826-4a11-82da-462b96d1fd6f/zojutojozakamimatatejedo.pdfIn PDF document text
    • http://pikuvideposem.epizy.com/inspired_history_class_7_answers.pdfIn PDF document text
    • http://sewegex.epizy.com/30986135451.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/the_stand_1994_miniseries_where_to_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c985e53-4a49-4b1c-b656-40b1b15dbc68/34721866041.pdfIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_13a2ac7babbc4d4cb55897b6bd0170ea.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_ed949d666cef40afb91a2c405f9defbd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/59896352112.pdfIn PDF document text
    • http://vezexosewomex.epizy.com/beyblade_burst_god_episode.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_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 5816 bytes
SHA-256: fe3cc76aa562f96e5e8a0db5dbeda3e342cdf6e5acaa72d40b208ebf77f61562
font_01_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 11588 bytes
SHA-256: 6c739dedfc171624a8dfe9a142a5f1330496263e8d8cb9c858de12371c189c56

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