Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9852ff2ffb038d3…

MALICIOUS

PDF

75.1 KB Created: 2021-03-05 16:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a3f7c9a09dbed3b32d85779dc3d8bdef SHA-1: 98794a0ab17a1346f962702f6f60478923091d59 SHA-256: c9852ff2ffb038d3766cf5afdaf6d5c9def0b90d97c16f072d508fb72ffe0c69
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute traffic or host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ponafet.ru/strik?utm_term=topics+for+essays+for+grade+6 PDF link annotation
    • http://vonoxafaku.scienceontheweb.net/bookstore_computer_systems.pdfIn PDF document text
    • http://kinazeponuj.iblogger.org/60323557646.pdfIn PDF document text
    • https://kazilapematif.weebly.com/uploads/1/3/5/2/135293457/dokibiro.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/hugh_ferriss_the_metropolis_of_tomorrow.pdfIn PDF document text
    • http://buputenajonix.mywebcommunity.org/kitchenaid_pro_600_bowl_adjustment.pdfIn PDF document text
    • http://waxinexedodupij.22web.org/aap_se_milkar_mr_jatt.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/motodijudak-bigedoza-figus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulumasofip.epizy.com/91138574704.pdfIn PDF document text
    • http://katezoluvezile.epizy.com/pixelmon_mod_for_minecraft_pe.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_1988a4bc364046e9b12b0f3e8d56b0d7.pdf?index=trueIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_a7e5cc9b05404719b5ebff8a7cae3747.pdf?index=trueIn PDF document text
    • http://gitodake.myartsonline.com/72438219794.pdfIn PDF document text
    • http://dozirojaj.rf.gd/tudafamugepobowugokesew.pdfIn PDF document text
    • http://dofovomomame.epizy.com/27766635167.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_947972def3604496a4f3ba6381ae00d1.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_7a12feeb9bd14b5295c324af1710d0aa.pdf?index=trueIn PDF document text
    • http://mudozegiviw.epizy.com/ilmi_gk_capsule.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_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 5496 bytes
SHA-256: 575484118e1566ab987cbf801d9108a3a4f78e68cb590f0bdc9bbabe18d4f889
font_01_sfnt_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 10324 bytes
SHA-256: ba4cee67b08281f16c801c53c7e0871347efe5a87c7e210ebac88374e22ef857

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