Malicious PDF — malware analysis report

Static analysis result for SHA-256 757504fa2c9ea33c…

MALICIOUS

PDF

85.8 KB Created: 2021-04-08 01:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d501c2528f512be200bd8cd65729d554 SHA-1: 78b4d3880986be38944b44427302176eb8fa2f06 SHA-256: 757504fa2c9ea33c90f6eb30c96255f493d127c981890980ded4d68ce307a061
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary suspicious URL pointing to a domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

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://pelibifir.ru/strik?utm_term=clases+de+guitarra+acustica+online+gratis+videos PDF link annotation
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/pilixetusi.pdfIn PDF document text
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/mogujiwotixe.pdfIn PDF document text
    • https://warimeso.weebly.com/uploads/1/3/4/7/134720830/sigaxe.pdfIn PDF document text
    • https://gulijigomun.weebly.com/uploads/1/3/4/3/134350957/sosikub-lopupaf-labopulul.pdfIn PDF document text
    • https://nimapefakapag.weebly.com/uploads/1/3/5/3/135324130/gixekoneluba.pdfIn PDF document text
    • http://totalcreditreport.info/23220800194m7syz.pdfIn PDF document text
    • https://bimefitovaj.weebly.com/uploads/1/3/1/4/131437299/1020789.pdfIn PDF document text
    • https://nazemetov.weebly.com/uploads/1/3/3/9/133997276/5789689.pdfIn PDF document text
    • http://agreevudb.rest/15379096364q20s.pdfIn PDF document text
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/1388326.pdfIn PDF document text
    • https://jovegubegatok.weebly.com/uploads/1/3/5/3/135318826/bijeteli_fajatib_witulodamutaru.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/6a152de7-ab0c-4583-b393-3f81d250fbe7/mossberg_500_ati_tactical_scorpion_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/windows_10_quick_start_guide.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_25bd2bcfe4b74337b60854e5992c61f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuponefi/supply_chain_management_certification_courses_in_mumbai.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/broadlink_rm_mini_3_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de7aa5b1-ab8c-49b4-9166-a4d78fa214fa/51877657607.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_bfd431970330466481d352e41ec1db06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa851e17-7b11-44b3-8f42-22d2b4f085d2/rinnai_gas_heater_fault_12.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 5072 bytes
SHA-256: 6bd6660b47b46838fb4e253c7eb14526f8455af5e43433b18f2de14e795fb581
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 11856 bytes
SHA-256: b4fdfd7260ebd711d5d460c80ed3ba20f705c94a79023cca1c464ef2241ef1c3
font_03_sfnt_off00013086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13086 16588 bytes
SHA-256: bb845b5975f5e9cc35f8ef1c5aeeee41a060c6ed364b355a4fee26763691ec8f