Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8a6896062bc5ba…

MALICIOUS

PDF

77.7 KB Created: 2021-04-09 00:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5ecfce6bb506e0ef7bb22fd115d95aca SHA-1: 15de90134a4130da8ae7c3b80749ce9921ebff11 SHA-256: fb8a6896062bc5ba94d0677034c471ac178070d82d20b313ece72edeb1aa377f
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 0.9996

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://golowaki.ru/strik?utm_term=the+crown+season+5+episode+6+cast PDF link annotation
    • https://mibirewisurux.weebly.com/uploads/1/3/5/3/135313447/vuxabemid.pdfIn PDF document text
    • https://pizizidoto.weebly.com/uploads/1/3/0/8/130873839/gimaser_rezawatesu_tewumerixix.pdfIn PDF document text
    • https://dobuzitususuv.weebly.com/uploads/1/3/4/4/134470967/gunejopuparozexavib.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/i8hhVgK/lipakunibubuluvatulab.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/gfihjfz/50292939434.pdfIn PDF document text
    • http://budofibo.mygamesonline.org/91992511608.pdfIn PDF document text
    • https://vinazova.weebly.com/uploads/1/3/2/6/132695356/1055631.pdfIn PDF document text
    • https://verevivomilob.weebly.com/uploads/1/3/0/7/130738769/sifixubite.pdfIn PDF document text
    • https://kokazokurazafan.weebly.com/uploads/1/3/5/3/135348127/runuma.pdfIn PDF document text
    • https://cdn.sqhk.co/zeburozupax/ie4iea7/sijira.pdfIn PDF document text
    • https://gijejutet.weebly.com/uploads/1/3/5/9/135974865/zokimupi.pdfIn PDF document text
    • https://kogababofaf.weebly.com/uploads/1/3/0/9/130969162/bb746b3d33e7.pdfIn PDF document text
    • https://xolufoxe.weebly.com/uploads/1/3/4/5/134501271/mabuzedejex.pdfIn PDF document text
    • https://zusikemibuv.weebly.com/uploads/1/3/1/6/131606719/9513391.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/mijumomub/how_to_clean_vicks_humidifier_vwm845.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/how_to_calculate_interest_on_home_loan_in_india.pdfIn PDF document text
    • http://witesenigo.atwebpages.com/rutuxexesavaxoti.pdfIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_a49cac7e2f9048f0b0c394b93c530718.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_f4c035cc6a694bec8b9a2d51dfa25365.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/70470769636.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_a07448650f95407a84def8bc25e899b1.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_2d43c6f89d10465398ec6bcba9ce5cb2.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_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 5448 bytes
SHA-256: f2c13cff850bd8b4d2dd6a08d157cccf652608be19bb16ef9fd9b8c8398b81e7
font_01_sfnt_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 11268 bytes
SHA-256: a0461401a433b39252c12c8202cf3f11efd545c1feed0b534d9c6d42407213b6

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