Malicious PDF — malware analysis report

Static analysis result for SHA-256 5170fb49df1268a1…

MALICIOUS

PDF

82.2 KB Created: 2021-04-03 09:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f3ec501170e3798c8cbc8e49d6222c4b SHA-1: e7ca2dbd0b25a6d21c96517d944ea6f227d40e0a SHA-256: 5170fb49df1268a127a34dc20ad85b856c11e24f19cf4d784b3ac684a24a969f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs that likely lead to phishing sites or malware downloads. The heuristic PDF_SEO_LINK_FARM specifically highlights the presence of a mass external PDF link farm, suggesting a tactic to distribute malicious content or engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://pelibifir.ru/award?keyword=arduino+uno+r3+datasheet+pdf+download PDF link annotation
    • https://cdn.sqhk.co/tubivuvopitu/dhehbjc/workbook_spreadsheet_definition.pdfIn PDF document text
    • https://bawenijujobafo.weebly.com/uploads/1/3/4/6/134670929/5259135.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/eifjjha/love_hack_book_1_walkthrough.pdfIn PDF document text
    • https://nanupubixo.weebly.com/uploads/1/3/0/9/130969545/5507934.pdfIn PDF document text
    • https://malolikekex.weebly.com/uploads/1/3/4/7/134718462/5506075.pdfIn PDF document text
    • https://cdn.sqhk.co/fowurona/hghaNdp/push_box_game_solution_level_11.pdfIn PDF document text
    • https://fakipaga.weebly.com/uploads/1/3/1/1/131163599/nudoposozaket.pdfIn PDF document text
    • https://zakekeru.weebly.com/uploads/1/3/4/5/134584110/8373386.pdfIn PDF document text
    • https://cdn.sqhk.co/xegogeji/hjiaVmw/juwugoboguza.pdfIn PDF document text
    • https://woperuxotuxolo.weebly.com/uploads/1/3/4/8/134849923/tiwusekifat.pdfIn PDF document text
    • https://setitafonoje.weebly.com/uploads/1/3/1/8/131856277/gotidovurur-pijagisopuluke.pdfIn PDF document text
    • https://kuwuxezito.weebly.com/uploads/1/3/6/0/136090431/2474326.pdfIn PDF document text
    • http://lebanage.iblogger.org/adagio_in_d_minor_john_murphy.pdfIn PDF document text
    • https://wonelapafilujol.weebly.com/uploads/1/3/1/6/131606162/4c15ec8eb22ea0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_d179dd3bd86e484fa3bcf60f1a192ec1.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_79d461d8423f4aa3b64dfef28046cce6.pdf?index=trueIn PDF document text
    • https://5c297679-0032-4319-a2a6-6965cad4a691.filesusr.com/ugd/b0b521_0c8c04e599b8473f811b59c923772ad4.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_af1504c592e848b896e9edef4008b31a.pdf?index=trueIn PDF document text
    • http://rabopusafat.epizy.com/endless_legend_guide_ardent_mages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1462d3f5-b4cc-48b1-85d2-0720bf587cf5/tableau_public_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494f1c66-8872-423b-bfcf-ffc940a6f0cc/16705848602.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_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 5376 bytes
SHA-256: 4f0c28d158305ae60e7ae76d857ff687e33f31bc9c8002567691dc8ef8397ff0
font_01_sfnt_off00011511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 11688 bytes
SHA-256: 385bbda3ae75899fc42400ee33e408e2b9836765e46ce3a45322a048c40be010