Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8a9892e95369fc…

MALICIOUS

PDF

85.8 KB Created: 2021-04-05 21:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a7d3667a6d5c20d685eea52ee764066b SHA-1: e70ae6ab967db55b25ac54f68308599ab0ae9704 SHA-256: db8a9892e95369fcf0f88bd6ef2b269facf5c0f81a2dd0dedbef320b489daa84
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are generated in an SEO-like fashion, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

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://golowaki.ru/award?keyword=saake+sattler+algorithmen+und+datenstrukturen+pdf PDF link annotation
    • https://raxabebawozovi.weebly.com/uploads/1/3/4/3/134311701/bdd8f0aeddf.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxogafu/gejejd2/rijiwegewazebevaj.pdfIn PDF document text
    • https://cdn.sqhk.co/faxinomitux/hchyjha/glass_go_launcher_ex_theme_free_download.pdfIn PDF document text
    • https://vepenisa.weebly.com/uploads/1/3/4/3/134339982/lubijovitu-fetubokinifebuf.pdfIn PDF document text
    • https://cdn.sqhk.co/zaniridut/gyQLrgj/sozawano.pdfIn PDF document text
    • https://cdn.sqhk.co/guvawatuzax/YQVhajh/domino_s_pizza_club_whatsapp.pdfIn PDF document text
    • https://cdn.sqhk.co/rokatodupi/f5Ojhgg/bvg_fahrinfo_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/aWoUCYF/peruluwozomuteguviradi.pdfIn PDF document text
    • https://fexegidonowagi.weebly.com/uploads/1/3/5/3/135325594/6334991.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/sixolose/mercedes_benz_c_class_2017_manual_transmission.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/sojekazeme.pdfIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_8e369fc22d5d41f58d34d75a04182a9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccca8674-534d-48be-bb45-d24462e77bbc/college_lacrosse_weight_training_program.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/jealous_guy_sheet_music.pdfIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_f208ba75857743b2921b3c30dd7d3626.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/crystal_report_xi_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/zonajavuralixona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32537785-4aea-47db-9727-6e4cae1e31f3/13018417093.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_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 5620 bytes
SHA-256: 042e3cea53a596de330b10e238bd2a73df6d3081a0d51e074c2107b53a9a6e62
font_01_sfnt_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 12508 bytes
SHA-256: 73bb686f5fee6bae26434d8caa16e5ddeee15b99d3610e4a0aa436cd0593772f

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