Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55a58c4da929909…

MALICIOUS

PDF

39.4 KB Created: 2020-11-07 05:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 13593d58a22eed7ff248477bb3ed5719 SHA-1: 722ae156f39f932cf94f86f079ed83629fac8567 SHA-256: a55a58c4da929909c090aa4b0e43d348607787327ab0c9a2fc3d9ec092083b64
76 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that points to a suspicious domain, likely intended to trick the user into clicking it. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of an external URI and the ML detection suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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=advanced+giant+venomous+snake+pathfinder PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373770/normal_5f8f620671a84.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/88386a18-ab4d-4724-bce6-c0ff6c3438eb/8467969163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6cdd8bc-6e73-47d7-9970-014eef3e0078/puvezupokaziramaloni.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/74506784740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd2902d-004a-469a-b408-1dfb38ea5681/the_undying_court_d_d.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/91913208515.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/pufixudesamikevajeroxit.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/pouvoir_assemble_gnrale_coproprit.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/aptitude_test_questions_and_answers_with_solutions_for_freshers.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/84986594063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02daaedf-9b32-4076-94ab-6238bb737fb0/91847830633.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_off00005a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A81 5652 bytes
SHA-256: 10511c1e2bfd034e6c087605d2349cf524109370cc1abf91693d6af4a508f819
font_01_sfnt_off00006dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAC 10320 bytes
SHA-256: bafbe411b7c664fd96444a196359a675ca93d94aa302035d2a3a9dd5c4dc920b