Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4eee2ffc548863…

MALICIOUS

PDF

77.7 KB Created: 2021-05-29 15:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5f30712d2e7e114ab93368de507a86ff SHA-1: ef38f839166fd8c3e6e2c356ff0797f64885cc36 SHA-256: bb4eee2ffc5488633a15d2cf8719a52e4e5c3525f1d405e5f29c26a6d9151ce6
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=what+should+be+included+in+an+exit+interview PDF link annotation
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/ridefitejudu-bogevufetuze-zuzaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487903/normal_5fc85eb80b681.pdfIn PDF document text
    • https://zepazilarewar.weebly.com/uploads/1/3/4/3/134310653/vaxowewezowe.pdfIn PDF document text
    • https://gosasaweju.weebly.com/uploads/1/3/1/3/131384289/firaw.pdfIn PDF document text
    • https://fologonalufofu.weebly.com/uploads/1/3/4/6/134694067/fuzapozifojej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_60460f3161ac2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408593/normal_60018f6967377.pdfIn PDF document text
    • https://vuwibisi.weebly.com/uploads/1/3/1/8/131856279/kozapav.pdfIn PDF document text
    • https://melajepanaxon.weebly.com/uploads/1/3/5/3/135398769/titemanujuxu-kaditufawokopi.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/dolamenagoxem-menifamunogowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496148/normal_6001c910a9852.pdfIn PDF document text
    • https://duluvozega.weebly.com/uploads/1/3/5/3/135327827/vapoko_rewule_bemomimegivur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_602adf590ec1d.pdfIn PDF document text
    • https://fevegukiso.weebly.com/uploads/1/3/1/4/131482975/6e352c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bdbc110-1c23-4f2c-bf76-1ecd479b0ed4/how_to_turn_on_soundlogic_xt_bluetooth_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/475c54a1-c1fe-4fc0-b931-59b4739ecd43/craftsman_13.5_hp_30_riding_mower_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d688879-1ae8-4e96-aca5-4c2787d49065/crochet_hat_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da29cc04-2e06-4111-b276-a1062190dadb/nejiworimug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79399b68-0214-4cd5-801d-2edb919b8cdb/235354815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef894d4b-c1d8-4830-80be-3c8b7fca1be8/how_to_teach_the_academic_word_list.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_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 5400 bytes
SHA-256: 80e9229ee6f7fea78fe4a8824b3c360c68673bc5a43e52ed7408dbc7c4970a61
font_01_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 10840 bytes
SHA-256: 307c213ed3fbde9e9de16b71207985bf5d0b312ae4da539492f7cc76d67d3ef5