Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52a9daed78b835f…

MALICIOUS

PDF

40.9 KB Created: 2020-11-09 03:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 3ae424de70c60104225a2513f9b278a8 SHA-1: b2b6161638ecb3a7630e03ff7a466088e5cb0d34 SHA-256: a52a9daed78b835fc8476c7dfd4ab6386e79d4d58beb43e194ab50c4f1168b2d
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://traffking.ru/aws?keyword=singer+manual+27 In PDF document text
    • https://vokozigaga.weebly.com/uploads/1/3/4/3/134316184/dbcc8926.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/a5c144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f9e1e3eb026e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tojegilebi.files.wordpress.com/2020/11/digimon_cyber_sleuth_medals.pdfIn PDF document text
    • https://lelijowig.files.wordpress.com/2020/11/85881369.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/atc_abstract_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/vizilumeguputeson.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/case_for_christ_study_guide_session_1.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/pelobewazuvebaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a17ccb54-35f9-429c-8f67-d536ae17b931/10568661546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6733caf-5382-46bc-b9b8-57edf7f942dc/mutoralavaru.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/apk_smartwatch_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/mokomogonumodazutuxolew.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_off0000642b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642B 5140 bytes
SHA-256: 6bdbca9b3c8479037f3f5d1769bb24c6af0ee04bdffa57b314a3adb912f2efef
font_01_sfnt_off0000758f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x758F 9856 bytes
SHA-256: 750617c3284a9d219cdc7a2d574ba3f84e863bf96bcc07a7104559d8359a42b3