Malicious PDF — malware analysis report

Static analysis result for SHA-256 401fec95cc560317…

MALICIOUS

PDF

74.1 KB Created: 2020-11-26 09:34:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a25ceef1646905ff4fca5b915069214b SHA-1: d3ff90ed24a0078c52f469a9ddf2cbce4a752b7a SHA-256: 401fec95cc560317059658ea46873dc93b665cc63cd9a3db71b84bd75ad20b03
156 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 5

  • 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.
  • 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://traffine.ru/strik?utm_term=victor+of+aveyron+facts PDF link annotation
    • https://piminuwimizo.weebly.com/uploads/1/3/4/6/134674326/2847353.pdfIn PDF document text
    • https://xukoxaxap.weebly.com/uploads/1/3/4/7/134748194/wuselakezox_bosusazak_giravipu_wowujamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490524/normal_5fadaca802efd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f8763a3a9df3.pdfIn PDF document text
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/miwesifi.pdfIn PDF document text
    • https://rineragafuvotut.weebly.com/uploads/1/3/4/4/134442037/besiligugov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/widiku/2327255516.pdfIn PDF document text
    • https://s3.amazonaws.com/vasagesorajirem/unblocked_air_raid_basketball.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/ramadan_2019_calendar_india.pdfIn PDF document text
    • https://s3.amazonaws.com/vasagesorajirem/google_az_news.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/best_gifts_for_wife_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db8213b-5309-4121-948c-4228583d2542/wechsler_nonverbal_scale_of_ability.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/88271511235.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_off0000e53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 4968 bytes
SHA-256: 0f9676870bce974a4a05e2c34d23294030224a6643824b0b9c3507578fe9be70
font_01_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 11380 bytes
SHA-256: ceaa1a1c03e8fb9fdb3c50e4b65105db3a1a2802cd62bfcf5db9e33e78c0642c