Malicious PDF — malware analysis report

Static analysis result for SHA-256 4238ebbb60c9e38b…

MALICIOUS

PDF

68.6 KB Created: 2020-12-16 19:19:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3161c9c21f9c23435835b362a41e8be5 SHA-1: 21e15352078c00c524ec34a905d20034e6637926 SHA-256: 4238ebbb60c9e38bacc4392a561fd9ad776883a958040d4cdc0f94f1e3e0f06f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although the document body is heavily obfuscated, the presence of the malicious URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffmen.ru/123?utm_term=hannibal+lecter+costume+for+dogs In 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/ec11a44c-31fd-4034-8a6c-3026422f0c7c/nisizawekokegupinebufij.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5933e3dfdd95b60f4df7d/t/5fd046c75ec17a4c668c7200/1607485127687/bodoxilubatowusosofuxum.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/86656384200.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/aleks_knowledge_check_answers_math.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/70568387888.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/stryker_hip_hemiarthroplasty_technique_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/322bb309-dfbf-4150-a894-71ce088458ab/windows_update_error_13ec_visual_studio_2010_sp1.pdfIn PDF document text
    • https://s3.amazonaws.com/naramuro/water_filter_vacuum_cleaner_ds_6_water_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/amway_product_list_2018.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50a730b6b03258f4ffca1/t/5fcccdf2eb18547f4b82abce/1607257587282/centrist_compromise_meme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b535a874-634d-492e-9944-ce15630d8911/arissa_the_wandering_rogue_special_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f7fe355-8c34-410a-9616-425e06ba2ad0/nolegomega.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/vomezunuwub.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/gamestop_trade_in_bonus.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/pirate_bay_proxy_browser_list_2020.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_off0000cf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0F 5444 bytes
SHA-256: 1a6e818656350861345fa0d164b83d2bc25e39fcf3fd0efd11d8f91f8ba60ec3
font_01_sfnt_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 10504 bytes
SHA-256: 6e27dc01f1e5bfd19205bbddd6afe87b5bc6da3cb1690d1eb745d4d2b88270e2

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