Malicious PDF — malware analysis report

Static analysis result for SHA-256 109903d6d384bc4d…

MALICIOUS

PDF

129.3 KB Created: 2021-03-09 10:55:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ac0606761263983b51991d37c29cacec SHA-1: 0805f9ecfaeeb0cd45a14c7b2e9a3772b1f7a782 SHA-256: 109903d6d384bc4d683f06e400c8ac936eb36baa0de9883f9cfa93e4a66c08e8
144 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, specifically using an SEO redirector to disguise the malicious intent. The ML classifier and ClamAV detection strongly suggest maliciousness. The embedded URL points to a redirector, likely intended to download a second-stage payload, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/123?utm_term=cesspool+design+pdf PDF link annotation
    • https://cdn.sqhk.co/vatopibar/sPhhaje/mowujulirem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383679/normal_60039d6de87ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_5fd1ac1eba690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389104/normal_6036c0318996e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386076/normal_5ffa892fee94c.pdfIn PDF document text
    • http://runmasten.online/mozusimosonipos1grpb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_6035cdddc6d57.pdfIn PDF document text
    • http://itasda.online/21357782886pwnn6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387716/normal_5fe1c94e61d11.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/sHXhjsh/pokemon_cards_value_ebay.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/ifhibhe/crazy_shopping_cartoon.pdfIn PDF document text
    • http://myluckywin.site/hcm_full_form_in_police79seq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425912/normal_5fe48df8d92ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476146/normal_60093782f1a4a.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/akighj6/how_can_we_say_hi_in_chinese.pdfIn PDF document text
    • http://copyrightram.net/elsword_heroic_gear_guideu3npi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_b1b9e781876849f3b4fe4f287c3de7db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fffd30f0-6043-482a-8d21-f1e6c824b7b1/jlab_jbuds_charging_instructions.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_9c1fb19e8e834314897392edbda01920.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77894e75-ce3c-480a-bf03-ca3523c5ad0f/how_to_learn_kriya_yoga_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0bd9950-79ba-439f-bd71-178e21ffc3f7/when_is_the_new_dork_diaries_movie_coming_out.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_5e49a4652fbf497e9dbe005302b6ee9e.pdf?index=trueIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_c527e0831c9d4c3382088724815238ee.pdf?index=trueIn 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_off0001c3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3FD 4808 bytes
SHA-256: b8e0721cacf70d170235b216d0abce0e671bf6393352f404de654adf7f61203a
font_01_sfnt_off0001d473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D473 10324 bytes
SHA-256: 0ac130ae3a6f546215728543f4f5bcaa3b37c3350be4b6478862850980503f1f