Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a868bb0e672f99d…

MALICIOUS

PDF

80.8 KB Created: 2021-05-02 10:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 21615d90e12d467b1f9facef73198586 SHA-1: ed421f15a4f2873acdbbac7b0d238d7c06cce964 SHA-256: 9a868bb0e672f99d38534db7335066005325ccd61d385f625e9d591dc35470f7
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to 'score to pass cfa level 1 exam', indicating a lure. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV and ML detections, strongly indicates malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=score+to+pass+cfa+level+1+exam PDF link annotation
    • http://grampus-shop.com/91674602508z9d1d.pdfIn PDF document text
    • https://jabiwogox.weebly.com/uploads/1/3/1/4/131453485/zigilalopizumez.pdfIn PDF document text
    • https://xaroduzorosu.weebly.com/uploads/1/3/1/3/131398324/ruwet.pdfIn PDF document text
    • http://show-visitor.xyz/sch_truyn_kiu_ch_giikf7r9.pdfIn PDF document text
    • https://mitiguranam.weebly.com/uploads/1/3/4/4/134456526/8691070.pdfIn PDF document text
    • http://razvivatel.blog/waveluluwofebegufogukaxivjyly.pdfIn PDF document text
    • http://greatholl.com/total_quartz_20w50_pricewcmo5.pdfIn PDF document text
    • https://pegufozexak.weebly.com/uploads/1/3/5/3/135317465/cb9b249b4e.pdfIn PDF document text
    • https://dulumomotuvubu.weebly.com/uploads/1/3/4/7/134759228/vonilafasizavok-kisawowuda-wituvunofapazux-kabejutizo.pdfIn PDF document text
    • http://teasmall.space/raiden_legacy_2._3_2_apk3m4a3.pdfIn PDF document text
    • https://dibumofum.weebly.com/uploads/1/3/5/3/135313591/tefexibami.pdfIn PDF document text
    • https://xufipenisugiw.weebly.com/uploads/1/3/0/8/130873979/613ce9fa80.pdfIn PDF document text
    • https://sutafufig.weebly.com/uploads/1/3/4/4/134402916/6055e9633ecf75.pdfIn PDF document text
    • http://energierecrute-emplois.com/558599560269ivas.pdfIn PDF document text
    • https://zutomufafet.weebly.com/uploads/1/3/1/6/131607254/fazifumezen_kubowomafifuxiv_woginak_nulifazi.pdfIn PDF document text
    • http://ulekschool.online/zorigibenovibegc98qk.pdfIn PDF document text
    • http://handler-autoscout24.com/bleacher_report_live_chelsea_vs_valenciazb86k.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/nojefugasareken.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/nevovumowa/project_management_skills_summary_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/tobake.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/illinois_llc_articles_of_organization_form.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/what_wild_plants_can_you_eat.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_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 5444 bytes
SHA-256: 4d8de304ec7c0c705cfae1381443e6bfa36cbd360cc6a87eae43738741914552
font_01_sfnt_off00010c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 12228 bytes
SHA-256: 6651a065f1aa64c6dc88d07c7425d48cc7bded71ba4ef81e5677e5e327bb3b99