Malicious PDF — malware analysis report

Static analysis result for SHA-256 641520045e27b310…

MALICIOUS

PDF

44.6 KB Created: 2020-11-09 01:15:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 1de26faaa9bdf0a3debfaaa77a9f005b SHA-1: 4235e10fe86572f2cea3575739a6f6de0de90453 SHA-256: 641520045e27b310ed56d3822cca38cd1639192667011cec7f5d79d6cb7d6208
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://trafffi.ru/123?keyword=chemistry+chapter+11+worksheet+answers PDF link annotation
    • https://luxexawasoju.weebly.com/uploads/1/3/4/1/134109261/2619278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381102/normal_5f92587e248c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5f908511187dc.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/75cfd0e8757.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/julaxel/86880638187.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/star_in_a_box_activity_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b672ab09-5192-449f-9cbc-e5cf6762ba87/26872179571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6791c5c0-48ab-4f99-a0ab-4945ecb74cea/86549491021.pdfIn PDF document text
    • https://diwelozizof.files.wordpress.com/2020/11/battlefront_2_mouse_stuck_in_middle.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/initialize_list_python_with_range.pdfIn PDF document text
    • https://s3.amazonaws.com/mejediparaxi/11034196553.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/dr_phil_episode_list_2020.pdfIn PDF document text
    • https://lalibakorex.files.wordpress.com/2020/11/the_trait_theories_of_leadership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f50eb9-b99b-4071-a2a3-e5d87aafacc9/lajijijebesonefebuxomiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e4cece-1939-4903-b0af-4bffbc0e2372/ginufuteji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d411f0b6-d918-48db-8fee-e74499de53c1/pilgrim_cove_camp.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/lidomumi.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_off00005e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E26 5260 bytes
SHA-256: 160e9739b881b6b82def5b9806c496338f27db232f94a1bca8002e80e8074a25
font_01_sfnt_off00006ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFE 11804 bytes
SHA-256: 6732f5af03a6f37841d8003a70bd4592b940480b6de21018982923f0f7fd343b
font_02_sfnt_off000096ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96EA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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