Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d1002f3f27835a…

MALICIOUS

PDF

75.4 KB Created: 2020-11-10 07:33:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e318ad716c49a305c752926b08f3c75e SHA-1: e2b25940d7efd45cea1ec0c42104f8df8f287ea5 SHA-256: a1d1002f3f27835a5a50bc252b1ec900b1783041d988c861c909fcf654d61b2f
194 Risk Score

Malware Insights

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

The PDF contains a link disguised as a free download for a 'Schwinn bike computer manual PDF', which redirects to a known malicious infrastructure. This SEO-based redirector is a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/aws?keyword=schwinn+bike+computer+manual+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/gujarat_budget_2018_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/312b4021-3c66-4dd9-a3e9-032e012f8736/dangal_full_movie_dailymotion.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/competition_law_notes_india.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/23004782441.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/asvab_practice_test_2020_air_force.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/86275023987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbf27849-4314-4ae8-aa2f-e8850747a0f0/30325383515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6349c456-ed12-4a13-ac74-69041d892f94/datonegifujinemoridet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/792b964e-3973-434d-87eb-2f1ceb1b5d98/3000_solved_problems_in_linear_algebra.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/glitter_series_lol_dolls_fancy_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8fd591a-d4bc-4e1e-8a7a-c1582d2cc337/xivopunenuvivodivilufir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/632a669c-b7e3-4ba0-8ae3-b74ca3936647/22504687827.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/bowatesogope.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/61992272653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1db128a0-1e72-41db-9586-f416b2cd72cf/tonabebapukajitob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8b1814-5f82-4dee-9614-749292f93882/seattle_to_spokane_flights_alaska.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_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 5616 bytes
SHA-256: 1e515548fed65725a211187433290e7b366030c9b69d95092b0f1722365a9386
font_01_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 10388 bytes
SHA-256: 98994fdced6a6eaf0297ccb0ea9a73c7965aae2986def9b4f300f77ee1f693d8