Malicious PDF — malware analysis report

Static analysis result for SHA-256 da83a28394629bb4…

MALICIOUS

PDF

72.6 KB Created: 2020-11-08 19:47:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 590c62520586d25476adbd8d0d3816ef SHA-1: 82ab4b665950b377619ba436d29c13b7d2398861 SHA-256: da83a28394629bb41875c7df8b7ce785b19bbf231594edeb24fdf485074bad1f
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafficel.ru/aws?keyword=words+that+start+with+inter+prefix PDF link annotation
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/fajoniwuwakabezodalu.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/gopabi-xixiko-donodije.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/53670e89-cc29-4bcc-bf2d-9ef5400df301/nedozi.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/juwokunerojegad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a22f5620-f196-448c-84e4-d7957c9487ae/tuluterejan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06634e5-e6b0-41f3-be6e-221864022ae9/42139802292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3712eb-13bb-4e22-93e2-97714b25466e/10750625678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3509186-f65a-4e33-a0d1-4f2a313b1ae0/41311720147.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/assassin_s_creed_2_parents_guide.pdfIn PDF document text
    • https://lalibakorex.files.wordpress.com/2020/11/wasowisigota.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/94297397688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d824261-7cf4-4443-8932-c985fc140795/kiliferem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABF 39424 bytes
SHA-256: a31550b72c9f2d7074619b3c404a6231401add73220e2c5fe299eb29e7bac9e5
font_01_sfnt_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 5268 bytes
SHA-256: c0c2fe80f946355444c172ec468d568d6331a7e3305f124145aace27c822626f
font_02_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 10016 bytes
SHA-256: bb8b801bac25eda80e6e9467ab13ccb1e6771da9153772a63212133dd6f3f4b7

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