Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cbad84f5e3ccdc…

MALICIOUS

PDF

105.7 KB Created: 2021-03-20 06:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b521628ba9e006ccb7ba3b0f30ec93c4 SHA-1: ceb9310bce8a5e6d90a92288dea5e56915eaced8 SHA-256: a9cbad84f5e3ccdc53e3b90a74b81030b9d7de9017fce94521e8259b1f81a486
194 Risk Score

Malware Insights

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

The PDF contains a link disguised with a book series title, directing users to a known malicious redirector. Heuristics indicate this is a malicious redirector and a phishing attempt. The ML classifier and ClamAV detection strongly support the malicious classification, suggesting the document is designed to lead users to a malicious site for phishing or malware distribution.

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://yafferge.ru/strik?utm_term=percy+jackson+and+the+singer+of+apollo+series In PDF document text
    • https://cdn.sqhk.co/vitimosugu/zWgjngc/marble_a5_2020_diary.pdfIn PDF document text
    • http://esagafow.fun/yeh_shen_themegtlz5.pdfIn PDF document text
    • http://agent-ritual495.online/fesekui85z.pdfIn PDF document text
    • http://test123test.xyz/oedipus_rex_characterization_chartpz34p.pdfIn PDF document text
    • http://verification-help.business/nufebugex7th0h.pdfIn PDF document text
    • http://fasad-dom.site/driving_test_questions_and_answers_nye1c6m.pdfIn PDF document text
    • https://cdn.sqhk.co/bodevoposuji/vificjj/local_spots_in_las_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/motuvitewodi/hfiiXYb/95312462494.pdfIn PDF document text
    • http://reduslim-official.website/vukemapavurq3n9m.pdfIn PDF document text
    • https://cdn.sqhk.co/rimiwetatu/dAiigfu/boliyan_punjabi_video_song.pdfIn PDF document text
    • http://instapresent.site/baby_girl_names_2020_listg8jp4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/schengen_visa_online_application_form_dubai.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/54319107929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e38b543-12cb-4a98-85bf-e2283603176f/kenmore_600_series_washer_lid_lock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c48b57d-edfc-4a81-b0d4-d67dc2cef91c/what_is_gong_gong_in_chinese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc07ebe0-b5e9-4844-8056-b6d1cfc0ab5a/sonic_menu_shakes_specials.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/nsdl_acknowledgement_number.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/20083802437.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/31007090123.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_off00015960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15960 5660 bytes
SHA-256: f9a0fb5a07d23e428d8772984ad479c4de979b37909cde6c24d76187a117397f
font_01_sfnt_off00016cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB3 13312 bytes
SHA-256: dc6b4c354edff9a6d30f122b345ee210dc90fae16e8d4ce0f78e888cced1c0ae