Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecab87659210119…

MALICIOUS

PDF

78.2 KB Created: 2021-02-02 03:01:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 77022e2dc8b60059774481ae29d24bbf SHA-1: e449ebea199da09bcc4d8ecadd3a6d0be7a751d0 SHA-256: 3ecab876592101194c9f3dfdef158189c05ca7bcec37afd27f5bf95096f3dfad
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure. The heuristic firings indicate a PDF link farm and a malicious redirector, suggesting the document's primary purpose is to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=common+and+proper+nouns+worksheet+high+school In PDF document text
    • https://suzexefovewav.weebly.com/uploads/1/3/4/6/134640410/luxojulezo-wixefuditimumib.pdfIn PDF document text
    • http://potobol.22web.org/bodyguard_movie_music_ringtone.pdfIn PDF document text
    • http://modebedunizux.iblogger.org/ignou_bshf_101_assignment_2018-_19.pdfIn PDF document text
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/cb1ccc526027.pdfIn PDF document text
    • https://suguturame.weebly.com/uploads/1/3/1/4/131438741/zuzejimab.pdfIn PDF document text
    • https://jobifavizatop.weebly.com/uploads/1/3/4/1/134108852/panelorasidated.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
    • https://s3.amazonaws.com/midaguvimabof/arangodb_performance_tuning.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/99199683586.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/android_rom_manager_for_pc.pdfIn PDF document text
    • http://zumewozuzetarun.epizy.com/zitelodezewadutako.pdfIn PDF document text
    • http://xawoforusur.epizy.com/xafininiwipiribozamove.pdfIn PDF document text
    • http://fuzulaj.rf.gd/customs_declaration_form_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/repakuwaruz.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/disumobusedokutupilo.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_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 5548 bytes
SHA-256: 893dd80d57f52e05e510922f65d363fdcbe27875a7a6d73cb86e6b75484865c7
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 10504 bytes
SHA-256: d67d38d289d8c0acbde36419a910ceb24f7f3434121d264cd7d09d7177f2047d
font_02_sfnt_off00011d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D96 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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