Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9ed1767a8fa389…

MALICIOUS

PDF

70.4 KB Created: 2021-05-17 15:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b2156fb7e04a1f4cb294588209638c4c SHA-1: 2030363894f8eb85ad8dc92e438dfb17317a3e8b SHA-256: 2f9ed1767a8fa38950aa329fd1cc6e8b05d7483a09e4a9f7f6742b23ccf65164
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified as a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary IOC is the redirector URL, which is likely used to host a phishing page or deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://dafemum.ru/strik?utm_term=synonyms+and+antonyms+worksheet+for+grade+5+pdf In PDF document text
    • https://cdn.sqhk.co/xovepejegosi/Phgl35T/6025193604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457857/normal_605a3db71c713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_600c85a9a925e.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/jivhdFu/top_programming_languages_2020_salary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463005/normal_6007bd8236b30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_604a56333c492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_601a86ef3e78b.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/728b64c6-3f01-44e1-a402-9420d30f884e/bhagavad_gita_complete_book_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/bodyguards_and_assassins_movie_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/bavibubokanusugejonexaser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a06443-786c-4061-a36c-08f8466a677a/is_oscp_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7987c9fb-a633-487c-a4d4-c30ac52249cc/tixefovesulemijogolijeme.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/aanewale_kal_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e69c1c-d6df-42ac-a3cf-819783f5e072/29799714704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c56018a-128d-4b04-a60a-8a911200220d/fronius_inverter_error_code_475.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/asma_sintomas.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/22543757339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16acb87-c9d3-46f2-90c8-72ad8eb00672/97295000032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01b1d26f-9ab7-496e-86da-84cf1220e22b/how_do_you_reset_a_kindle_fire_7.pdfIn PDF document text
    • http://defisunukotizid.epizy.com/benim_hocam_eitim_bilimleri_soru_bankas.pdfIn PDF document text
    • http://musizaxodolof.epizy.com/the_exorcist_series_cancelled.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_off0000d349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD349 5908 bytes
SHA-256: 83ab63a4790ae7aa7997289e4ce530bb25699f2df1761acaf89b96cbd70af4cd
font_01_sfnt_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 10720 bytes
SHA-256: 4faf4fe68c60cd6e37eee221267cf089b0822434b2d1cd80bcdf9191d3591c7f