Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a4cc08fffadb87…

MALICIOUS

PDF

82.7 KB Created: 2021-04-05 07:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 920c8400027526dcf644cf84016115da SHA-1: ce6cdaed4e31b7a2436c741a3cf4b565e92511c6 SHA-256: a2a4cc08fffadb87f1b9696e6e11a8900065954e4120b09c3eeb5468598be67f
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an SEO redirector to disguise the malicious intent. The embedded URL points to a domain associated with phishing, and the document body, though obfuscated, suggests a lure for a worksheet. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/wix?keyword=compounds+names+and+formulas+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/sowanigog/zIgehde/video_player_hdmi.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/ijpjfAZ/faringitis_usu.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/Eiciija/31903707271.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/Jgi2kha/fuvaru.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/ibvfsTl/oneplus_switch_app_data.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/begejjR/daleza.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/ggu72ii/31730633045.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/heKThgy/77626635199.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/h2hinia/3959956010.pdfIn PDF document text
    • https://cdn.sqhk.co/solumapidema/LibdicC/soxeribibirarodiguvamujar.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/jhjf8VY/download_shoot_bubble_extreme.pdfIn PDF document text
    • https://cdn.sqhk.co/tetolonul/YSiiihn/19015066840.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/7a6f9c95-5e98-4d93-bad7-810a22dfd0aa/taradokafudalofekum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e336f10a-67af-4bd9-9474-c69270b2590b/special_right_triangles_word_problems_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5067e29-ee4a-45cf-8c88-b5094ebf6cf3/financial_shenanigans_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c987f8ab-bf44-4b1d-8db4-709afdb3c11d/how_to_reset_service_airbag_light_on_2007_silverado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f329472e-e3b1-435b-9e16-6a73d5100315/defining_deviancy_down.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516bcf98-ed64-4654-9a7e-ca08953dd1c7/98087587232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f7e775-4a5f-46ca-9457-2791a3686051/latipibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ee2b14-0773-4a8f-a753-7aa906804e43/vivint_thermostat_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26759a9c-4578-468f-93d9-95a71f26f7b2/89783828329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9146a30b-ef9e-4620-9604-6fe9614a84be/918183328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/556afb96-dc0d-48f6-83ba-f5d0e700f292/lokupuwowibuzer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4bbc3de-a77b-4197-81e2-ed97f50b8ec1/lidezirariwedolufag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/713d0be0-2ec0-48ce-aee3-886f284c6548/64195957683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d4d212-698d-4787-8f9b-38258f1a70e5/40249128920.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_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 5344 bytes
SHA-256: 3f738fe11b13590ad6bfcad51cbed7af8e0485d795d7b8170b040e83a8f82634
font_01_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 11824 bytes
SHA-256: 1db2c541434e78fe12301abd2c46e03ccef4062ea274cc925d68173503867049