Malicious PDF — malware analysis report

Static analysis result for SHA-256 800559bf5155ce5e…

MALICIOUS

PDF

85.9 KB Created: 2021-03-27 18:32:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a73e4b90dad8cf8982508f98eb848e91 SHA-1: b110fd6df79c5cf660af8461e60af4fb3da85342 SHA-256: 800559bf5155ce5e8ffb7d5f27e7b6962017db27d3a3db5621488e32c5bc6c35
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, specifically using an image to trick users into clicking a link. The link redirects through an SEO redirector to a malicious domain. While no scripts were extracted, the PDF structure and embedded URLs strongly suggest a phishing attempt to download a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/award?keyword=arduino+complete+guide+pdf PDF link annotation
    • http://orbitan.fun/kereriwiruritafosefusbkvh.pdfIn PDF document text
    • http://gagewetero.iblogger.org/bengali_books_free_site.pdfIn PDF document text
    • http://linza.media/orphan_drug_designation_annual_report_templateaz9b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448345/normal_60290c2ed93a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409607/normal_602ffec827a70.pdfIn PDF document text
    • http://francobusiness.com/ddp_yoga_coupon_code_2020h25aj.pdfIn PDF document text
    • http://jobs-ingenieur.best/j_ai_envie_de_coucher_avec_mon_filsxgssv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_5fd1e676cdb71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/altice_one_remote_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff58f58-a1ea-4a08-bfc8-544806feb799/canon_repair_code_b203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec26864-8362-4bda-9cf9-408c51042198/94352655484.pdfIn PDF document text
    • http://sajetubaj.epizy.com/97721033351.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/urine_culture_report_sterile_means.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fde45518-ec6d-42d3-bcf6-4ae75a644cbc/51404632972.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/monukesuduzoguwaxaz.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/free_ccrn_neonatal_practice_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/jezirevesowemufejumawi.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/honda_125cc_dirt_bikes_for_sale_near_me.pdfIn PDF document text
    • http://ferenekukosazu.epizy.com/isometric_drawing_paper.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_off000110c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 5076 bytes
SHA-256: a9414de13f30dbce0b962d238bc3d2bed1ce567f8438660e5445bbccb2b3d6ca
font_01_sfnt_off000121fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FE 11980 bytes
SHA-256: ffdc4f2d77648ff78840c07e818cc071c625b01fdabcbb6e894799a6e687f952

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