Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec16be09f50adfea…

MALICIOUS

PDF

74.0 KB Created: 2021-02-12 17:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 722eba585bb5cbb31d2f7b7a800b6968 SHA-1: 38227cdb69ee383e007a2fe2e0028c9e32e36d4b SHA-256: ec16be09f50adfeaf104cae7f34f04a166542bb2c9fdddf19304eb711232e059
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://jacksth.ru/123?utm_term=boys+like+girls+thinder PDF link annotation
    • http://todayit.pro/televulabixajamoxi0gwbp.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/eK0hhTV/gbox_golf_reviews.pdfIn PDF document text
    • http://greenbike.shop/vipawuzewof1p4e.pdfIn PDF document text
    • https://zegoliro.weebly.com/uploads/1/3/2/3/132303320/temuxi.pdfIn PDF document text
    • https://wabatopopelak.weebly.com/uploads/1/3/0/7/130775953/1090348.pdfIn PDF document text
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/3603705.pdfIn PDF document text
    • https://kazawiluk.weebly.com/uploads/1/3/5/3/135384823/b5e9d4cc0a0c.pdfIn PDF document text
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/tujifejosetuxufa.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/awijZie/youtube_2020_subaru_forester_sport.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/xaicjfP/innovation_recharge_program.pdfIn PDF document text
    • https://pixojewunut.weebly.com/uploads/1/3/2/6/132695451/db551e79f60.pdfIn PDF document text
    • https://xuduwenonotowud.weebly.com/uploads/1/3/1/3/131379268/5706181.pdfIn PDF document text
    • http://olipaka.xyz/marvelous_meaning_in_kannada95rze.pdfIn PDF document text
    • https://pawusavexamase.weebly.com/uploads/1/3/0/8/130813618/xexotoviru_govema_vadosaso_zujewiramubu.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/fujadabez/mitorotulujivemekijasij.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/fenamidakatefi.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_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 5092 bytes
SHA-256: 561e0ef29d8e49a6c60c81d3ad75ebf7957c5467cbcdcbc35804963d83c7c009
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 10832 bytes
SHA-256: 5afbfa2bb880f3d5626be91a818b00d3112377d74c423a71ef0d43f76529dd9d