Malicious PDF — malware analysis report

Static analysis result for SHA-256 213451c2be07f03d…

MALICIOUS

PDF

82.2 KB Created: 2021-03-04 19:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c8cd9f8df8a8d404a0e1e1bf5484eece SHA-1: b177a2b1c8ac7baeaea46222b58fab2d01fe0f15 SHA-256: 213451c2be07f03d0ba38bb4f4b7e62de6af3c4a58dfbb40122ef6e7dd2ef8d8
126 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to manipulate search engine results. The primary malicious URL identified is 'https://druttle.ru/award?keyword=where+to+buy+a+treadmill+in+canada', which is likely a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/award?keyword=where+to+buy+a+treadmill+in+canada PDF link annotation
    • http://vuvulusigi.scienceontheweb.net/amazon_lord_of_the_rings_casting_director.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/67653982947.pdfIn PDF document text
    • http://sutiboju.sportsontheweb.net/gofaretu.pdfIn PDF document text
    • http://xomutukegadoj.mypressonline.com/gegaw.pdfIn PDF document text
    • http://vujejike.iblogger.org/dinogojozikagube.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/how_to_self_clean_whirlpool_gold_oven.pdfIn PDF document text
    • http://volewug.iblogger.org/redundancy_calculator_spreadsheet_2017.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
    • http://rulamiji.onlinewebshop.net/grade_7_math_pretest.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/46371307828.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_25877ceec6ce4824b95fadfc0f085572.pdf?index=trueIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_1a2b4b505a17419abef79916f0e335a1.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_27066b0828d24d65bf4c17ec445dc079.pdf?index=trueIn PDF document text
    • http://sujotoginejo.rf.gd/ssc_admit_card_2018_bihar.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_fc4ea181968b46d09e59aaa964b2aca3.pdf?index=trueIn PDF document text
    • http://xabibagozof.rf.gd/success_books_2020.pdfIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_be5ee9daf6ae493fabf12bc74c7b0fc2.pdf?index=trueIn PDF document text
    • http://nabowiruxurupob.rf.gd/mozakebeperotowidadejufa.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_fbe9dad45ecd488ab050fee31432a5f0.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_29e7bdd782754101a41136529ae92d64.pdf?index=trueIn PDF document text
    • http://welididoseburiv.epizy.com/fazikubaguxagizomex.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_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 5140 bytes
SHA-256: 0fc72da5232742a550a46e945100f5b35f28c2b2d1cd924c248554444e68321c
font_01_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 10836 bytes
SHA-256: fa83db5274140c51bd8817ee717220fbb6d6b247e7d7090dbd3b16389f91e220
font_02_sfnt_off00012d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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