Malicious PDF — malware analysis report

Static analysis result for SHA-256 9823a99b6bee305d…

MALICIOUS

PDF

37.1 KB Created: 2020-11-06 19:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: f3dad0db811239345cd38bebeb7934c5 SHA-1: dc0ab8cd666041758440a08a4de73f518ce7628a SHA-256: 9823a99b6bee305d0f867e57b86d3d5c692bd83bc9607f0c021491b9c58f3a90
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffking.ru/aws?keyword=teaching+textbooks+algebra+2+answers+pdf In PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/sulub.pdfIn PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/9b6cd.pdfIn PDF document text
    • https://josadezabo.weebly.com/uploads/1/3/4/4/134490641/9619283.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/2f450632-abe3-42d5-a26a-2b71bec98037/minecraft_beta_1.8.1_server_jar.pdfIn PDF document text
    • https://tibepitetuj.files.wordpress.com/2020/11/bivonetekobulidipekebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36abcfd7-1f66-426b-b4e6-30dd5b904b23/technical_readout_3145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5de82f6-e7fc-45d2-88ee-1f94432cd5b1/enertech_hvac_edmonton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87b7e9b3-79ed-4bca-92db-94bb56f2de7d/fokunadome.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/24675920223.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/social_psychology_exam_questions_and_answers.pdfIn PDF document text
    • https://fizafadolozu.files.wordpress.com/2020/11/31713389540.pdfIn PDF document text
    • https://tibepitetuj.files.wordpress.com/2020/11/56891646696.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_off00004f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F03 5860 bytes
SHA-256: 1b6dbe231101083e83130c31820055e32b649b9a0d70c369643e88454de02867
font_01_sfnt_off00006300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6300 10840 bytes
SHA-256: 82f0efaab22d8a4f483d16d0576c880f99688e64d1ce6ce3a2e1f451a35f20ca

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