Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b844d2abb57c1a…

MALICIOUS

PDF

67.2 KB Created: 2021-03-04 05:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: b9d2eb63fe2d4fd87040842e1d88f338 SHA-1: d0ba1257d4d733b6a8844813600efd5deeb66080 SHA-256: 37b844d2abb57c1a3052ec55161cde041e11d39b7e24860dac1ff27ac56042cd
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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/award?keyword=persuasive+sentence+starters+examples In PDF document text
    • https://marikiwow.weebly.com/uploads/1/3/1/3/131379510/4314833.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/nghtkgZ/uppercrust_motherwell_hot_food.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/iggjpFy/samsung_notes_app_update_2020.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/what_does_red_light_mean_on_battery_tender.pdfIn PDF document text
    • http://bumosid.getenjoyment.net/21848527739.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/iia1hfx/beletawaburezawux.pdfIn PDF document text
    • https://soberonapi.weebly.com/uploads/1/3/2/6/132681790/8298433.pdfIn PDF document text
    • https://budekimezarusij.weebly.com/uploads/1/3/5/9/135964348/dipevojomob.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/ziratepi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezamax.myartsonline.com/dalatebabina.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/woxugegivupu.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/wevajezulowuvipaka.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/84163518127.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/anatomy_of_the_human_body.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/washington_post_sunday_crossword_solution.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/defying_gravity_piano_sheet_music.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_off0000cd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 5208 bytes
SHA-256: 5d4fe113ca655443eea50afa8e15efe646f8919f4b65121108ec71710330082b
font_01_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 9504 bytes
SHA-256: 5bad344a2097020b4771415796b785640a8cb6a22058ad56355f2dbbfe0727d5

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