Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb9a114a981d28f…

MALICIOUS

PDF

81.1 KB Created: 2021-03-19 17:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1c2160e0449a49acb25e0140f9a75115 SHA-1: a8e2a446ffdd9dfff9903798df5efff87b0a5835 SHA-256: 8eb9a114a981d28f1533ce0ecf6f97decd70b78c2ad42199ad80ef16887d1489
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one prominent URL identified as a redirector for phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://soxebez.ru/wix?keyword=marriage+is+a+private+affair+analysis PDF link annotation
    • http://towexiwi.sportsontheweb.net/60960974702.pdfIn PDF document text
    • http://nexipufogavajid.getenjoyment.net/asatru_for_beginners.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/orthographic_drawing_book.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/76904186989.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_a17be34b8c4a4220a57a3aac4c8855d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ratixifo/34393024753.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/vikosijixinolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaf72774-0ccd-4c76-82d0-da7ec6607683/kunamuginoxudifoba.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/flight_simulator_android_games_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af5578f2-5c13-4765-9dc0-d6c3640b4738/73192814008.pdfIn PDF document text
    • http://dirulibas.onlinewebshop.net/28904814653.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/xolezosenunipusaboj.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/makisot.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_b30ad08c9f094ed5ad4d0eba1edbe5b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/netinuwa/letowabovagob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca68afd-9f80-4fcd-abf9-31d5f1b0403b/argumentative_writing_examples_for_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/jack_welch_winning_chapter_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/gmat_prep_books_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/mapufonefivobedupenu.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/94954542426.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_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 5236 bytes
SHA-256: a805719c3e0151c0c52fa758c2f685520ac26195e0fb28c3c6a00fed15f4f3d4
font_01_sfnt_off0001142c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 10376 bytes
SHA-256: 90005cb6e6c6d2aa32bf741df440060d486ce987cb013ce6cc85b8cef0df845d

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