Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe6c678463708a4…

MALICIOUS

PDF

99.7 KB Created: 2021-03-14 08:59:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 17953ded0b717fce912fe3822eba257f SHA-1: 777535be5f2d8a79346d0a1c92ee0d848603430b SHA-256: 1fe6c678463708a4eff35729cfe67dbca50db83159b090c181af2a1b50a03c11
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 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=biblioteca+de+alejandria+libros+pdf PDF link annotation
    • https://cdn.sqhk.co/vivokunavu/dKijfXA/39722800008.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/Aihjejc/foreign_policy_magazine_jobs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417403/normal_5fec15c3adfdf.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/Wohcwzc/klondike_adventures_mobile_wiki.pdfIn PDF document text
    • https://jatilupek.weebly.com/uploads/1/3/4/4/134491857/2437168.pdfIn PDF document text
    • https://cdn.sqhk.co/xibumediw/Zshhgcw/zara_home_mexico_ofertas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_6017c7f2de57d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472501/normal_6028948fec54f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450046/normal_5fe372e40e82e.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/7jbhaic/mifuxazapukowivi.pdfIn PDF document text
    • http://my-credit.info/vefugomaxugix24ns0.pdfIn PDF document text
    • http://specialsale.info/fanimapaxirabewajavoli5s7i.pdfIn PDF document text
    • http://lamovingcompany.com/jilamulaxemuzaxonigifujosdiyq3.pdfIn PDF document text
    • http://youla-24.cc/58070146398w3p3g.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/hbjdJjg/the_king_s_avatar_esports_anime_english_dub.pdfIn PDF document text
    • https://cdn.sqhk.co/wazewiput/cibQhgF/mutofaravuvuluzafo.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/267132307779nct1.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/3c8269ede2.pdfIn PDF document text
    • https://finamiwowekizo.weebly.com/uploads/1/3/2/3/132302732/newemozumikam.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/chi1bBt/fighting_tiger_liberal_mod_apk_2._7._1.pdfIn PDF document text
    • https://cdn.sqhk.co/xivomojuf/njfji3t/77813050012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393639/normal_604077d343c91.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/mezagoranafe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_f6075eb76f814b1bbbd294ad1b7daab4.pdf?index=trueIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_e16953f2c4c045d3a04ae10ca04ad2dd.pdf?index=trueIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_4d9852b5d29c4960961778f2abae16ea.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 13268 bytes
SHA-256: 1a0d123745438405d14c1210f8d2337890e4d201c0a5b415acb9e62e35c7fb95
font_01_sfnt_off0001393a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393A 5416 bytes
SHA-256: 7309deb6e0e9b45c61adc1579e069e581d49f06f1c378f18da58feab34450db5
font_02_sfnt_off00014bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB2 17316 bytes
SHA-256: b48645b571fd908f48c6e4fb881b62e6d67aa53c54ce681b05f49fb485474345