Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7dc4a42ab7f1a5e…

MALICIOUS

PDF

78.4 KB Created: 2021-02-26 03:06:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5c71c364e00a9c2f69f8ae5d8254c6ad SHA-1: d22e34ba72d0f5ce91a8d5dde5100c9271899c10 SHA-256: f7dc4a42ab7f1a5e2e0af593df3530f0e892324752f9ba50f4cfd8b50f89da7c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical PDF_SEO_LINK_FARM rule indicating a mass external link farm. The ML classifier and ClamAV also strongly indicated maliciousness. The document contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users to potentially harmful content or phishing sites.

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
  • 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.
  • 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://crophysi.ru/wix?keyword=head+soccer+2017 PDF link annotation
    • https://nifusesoporiw.weebly.com/uploads/1/3/5/3/135309858/5121373.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/24642344807.pdfIn PDF document text
    • http://ita-yog.space/batch_print_dwf_to2lprb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5feb78016c9e7.pdfIn PDF document text
    • http://kurs1.xyz/creed_2_workout_planhnsvv.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/how_much_is_aston_dbx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453889/normal_5fc5b1fd66e12.pdfIn PDF document text
    • https://jenazikefu.weebly.com/uploads/1/3/4/0/134017187/7519812.pdfIn PDF document text
    • http://newsportstechnology.ru/supply_chain_management_entry_level_jobs_houston9iwei.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/tometubufimopim/sentencing_council_guidelines_theft.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/are_dna_tests_very_accurate.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/melbourne_to_adelaide_road_trip_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/jquery_ajax_post_form_data_serialize.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/nixopijeve.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 5268 bytes
SHA-256: a808a6c0c97938fa394d59679435cbfe6cb9bff0e9ea33c1a017f3724edd11de
font_01_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 10012 bytes
SHA-256: eebdfd380509ee5cda2e6ba460d5a7675276876d58f0f16fca6e2bdfd27944c5
font_02_sfnt_off000114e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 16840 bytes
SHA-256: a90b5fa8f84117fc261d8aa9aca31c6c79ed245751c771d5da6c863204c74ede

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