Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b40ddbbb6eb7c99…

MALICIOUS

PDF

75.8 KB Created: 2021-03-27 15:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3b7d141d2ae8468c309b424294acc79d SHA-1: 553907662243457c98dab01b28a5feea8d977e3f SHA-256: 9b40ddbbb6eb7c998df624d651001d463f3ecdddee2b2d942376f25374288d19
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/123?utm_term=the+millennium+development+goals+report+2015 PDF link annotation
    • https://xadatazibinul.weebly.com/uploads/1/3/1/4/131483053/muwanavavazu-bokedi-tusudutowomet.pdfIn PDF document text
    • https://zavitakeji.weebly.com/uploads/1/3/4/9/134904790/nupewotupuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5fc6533a55672.pdfIn PDF document text
    • https://pomulopegodetom.weebly.com/uploads/1/3/1/3/131384256/7f612c.pdfIn PDF document text
    • https://xagajanum.weebly.com/uploads/1/3/4/5/134599721/62364.pdfIn PDF document text
    • https://falojabuvo.weebly.com/uploads/1/3/4/7/134774067/velimed.pdfIn PDF document text
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/6411994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495985/normal_603a94ec1a6ef.pdfIn PDF document text
    • https://ziduwoparexor.weebly.com/uploads/1/3/2/8/132815175/wuzadunajovuluxorunu.pdfIn PDF document text
    • https://ganizosu.weebly.com/uploads/1/3/4/4/134434359/saxiginotugobik-nenogifut-junomi.pdfIn PDF document text
    • https://pewovorawegoxuv.weebly.com/uploads/1/3/4/3/134351704/2e90fe8a44f6.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://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_2b8d71844b2c47c6a5240fb28b99940e.pdf?index=trueIn PDF document text
    • http://bigisewolax.epizy.com/18228162894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba91040f-b64a-4ab0-9e3f-98798b9d6d05/jack_reacher_never_go_back_2016_trailer.pdfIn PDF document text
    • http://jeduxotikeg.rf.gd/rufezudexuwekog.pdfIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_39962ff9d6774983bfdfd90500092953.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_5982d89232ed4c22bc28014e938162fe.pdf?index=trueIn PDF document text
    • http://lurozakilaxa.rf.gd/singer_memo-matic_knitting_machine_instructions.pdfIn PDF document text
    • https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_a740706905d24c28b501ba6f37413d82.pdf?index=trueIn PDF document text
    • http://semagovolabak.rf.gd/sosamuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/085b3945-ffe8-4da5-9e48-00ca78cebbe7/77631438999.pdfIn PDF document text
    • http://pexivakerofus.rf.gd/15795291252.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_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 5712 bytes
SHA-256: 52776731f9c5b730502088b7672e6435946a3023a4b811c500cbd908050f08fc
font_01_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 10820 bytes
SHA-256: 8a63edc7169380652a6545b05d2eff3242c7ea616cc3ff6ceee79c9ad3b9dc20
font_02_sfnt_off0001134f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f