Malicious PDF — malware analysis report

Static analysis result for SHA-256 995bdd945ef3e90e…

MALICIOUS

PDF

72.3 KB Created: 2021-05-07 02:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c61941a94e4a729ccb35b003c9bc3046 SHA-1: 5e8749a6368a427fe42c190e25cbd739397b74ee SHA-256: 995bdd945ef3e90ee566442fb5a9ec6fe73d3cb76e88a07ff9d5aba434fb79a7
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 0.9998

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://baarspo.ru/strik?utm_term=the+developing+person+through+the+lifespan+9th+edition+pdf+free PDF link annotation
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/7cf19c.pdfIn PDF document text
    • https://kuvikopar.weebly.com/uploads/1/3/4/8/134870245/65b3f3d8cfbe2e4.pdfIn PDF document text
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/c9b3cbc9f046.pdfIn PDF document text
    • https://lonamoki.weebly.com/uploads/1/3/5/9/135964194/5656870.pdfIn PDF document text
    • https://sapofekotor.weebly.com/uploads/1/3/1/6/131637774/c1eb29374730a.pdfIn PDF document text
    • https://paxolobiwoke.weebly.com/uploads/1/3/1/1/131163878/aba89af2.pdfIn PDF document text
    • https://fumevixupi.weebly.com/uploads/1/3/0/7/130775707/korisasevodeva-razipis-lipinurofeg.pdfIn PDF document text
    • https://tolejavufagus.weebly.com/uploads/1/3/1/4/131437822/gopovikababow_jobabe_ruzapenufitope_dizalobubozapak.pdfIn PDF document text
    • https://vitumiwoz.weebly.com/uploads/1/3/4/6/134697216/xokezebilo.pdfIn PDF document text
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/jibakojojuwodenixuj.pdfIn PDF document text
    • https://wipikiriku.weebly.com/uploads/1/3/4/6/134696444/76803bb.pdfIn PDF document text
    • https://waniritapi.weebly.com/uploads/1/3/0/7/130739375/9992839.pdfIn PDF document text
    • http://pudavepen.iblogger.org/cisco_ccie_routing_and_switching_v5._0_troubleshooting_practice_labs.pdfIn PDF document text
    • https://xefanopebowemid.weebly.com/uploads/1/3/2/6/132681782/jipufiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_b06b7b794ce24dcfac41e9f264dfb288.pdf?index=trueIn PDF document text
    • http://mimodiko.epizy.com/ninevumanexi.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_dc11131db1414d75a94fdd81d98c9a2c.pdf?index=trueIn PDF document text
    • https://4bbf79d8-97e4-42de-9a75-948158c354f0.filesusr.com/ugd/52f5d3_d34f413ceb7b4741b24fc0f6e2a5f6f1.pdf?index=trueIn 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_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 5468 bytes
SHA-256: ee16d3c5cf8d8e2900b0f887a6d8fe2c41baff71b0ba3ab625160020ca623835
font_01_sfnt_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 10920 bytes
SHA-256: 192dc7cabf2d6790040de86f4e3d10c8b30f1bc61f9f32e4902e73e238aaab0e

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