Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb969fb25dd96e6…

MALICIOUS

PDF

77.0 KB Created: 2021-04-03 11:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f749adc98bd521b8b23a0f45e17ffb2c SHA-1: ef39dc4022bd00aefec8d255ede4f76df522228b SHA-256: fdb969fb25dd96e68b617af69678143758adcc9de60e1bc362508a82566812d3
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 0.9997

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://pelibifir.ru/strik?utm_term=iata+dangerous+goods+regulations+2019+pdf PDF link annotation
    • https://cdn.sqhk.co/didozakir/jcpgi7P/circle_tv_schedule_boise_idaho.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/81872384824.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/vapatonave.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/068837622c5fdd.pdfIn PDF document text
    • https://cdn.sqhk.co/dimumaneda/2F7nij8/43244020324.pdfIn PDF document text
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/zoturidomuvomun.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/can_am_outlander_maintenance_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/dDzNVnJ/95667542291.pdfIn PDF document text
    • https://cdn.sqhk.co/mezomabesoki/mlib2pH/memejigelutesizugajatof.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/tolowamavekibox-wumutariwosil-rebabusubixu-filamake.pdfIn PDF document text
    • http://pinenud.mygamesonline.org/kojugowol.pdfIn PDF document text
    • http://novazeku.mygamesonline.org/66729832504.pdfIn PDF document text
    • https://cdn.sqhk.co/xezufulozuwo/Gvhbnie/tadabazisimedewifez.pdfIn PDF document text
    • https://cdn.sqhk.co/mitebosareki/oicgcuE/94310190661.pdfIn PDF document text
    • https://vanaguneselo.weebly.com/uploads/1/3/5/3/135341402/8686415.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemovimuwopete.atwebpages.com/taylor_food_scale_says_out2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e33dcc-8855-4afe-83ed-0e1e7812a0a8/music_in_theory_and_practice_volume_1_9th_edition.pdfIn PDF document text
    • http://dugerem.atwebpages.com/54389833464.pdfIn PDF document text
    • http://fadezanunadafik.myartsonline.com/conflict_resolution_in_the_workplace_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d9f74b-6534-4daa-ba36-a4382656f454/5_techniques_of_time_management.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_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 5628 bytes
SHA-256: 6f3dc08330b0675604ead1229332d831c5eccd9e3fab207a1a9e00f8dd694b3c
font_01_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 11292 bytes
SHA-256: c660275912d3210cad1acf2188050f5c0b973a78b5591df166d3f6259f628f3b