Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc35568e2d55a381…

MALICIOUS

PDF

78.8 KB Created: 2021-05-30 10:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a3ce6b7894e799650de2bb4e6c8a29e2 SHA-1: 59a7aa6d8db9f2836f64dcd70939147e1c791850 SHA-256: cc35568e2d55a38111bc8ead38d6013f1318334dde04d8f0c7b451f1e6cf0f77
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 0.9993

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://jacksth.ru/123?utm_term=airfoillabs+king+air+350 PDF link annotation
    • https://refiraledekire.weebly.com/uploads/1/3/4/7/134715744/pafawewapofi_ruvoraxes_turunuzoka_kukaribevosoxop.pdfIn PDF document text
    • https://mogoxolokelitaf.weebly.com/uploads/1/3/4/6/134645696/3b68a85b4e5f9.pdfIn PDF document text
    • https://letemoxitaja.weebly.com/uploads/1/3/4/4/134475957/zuxojanibug.pdfIn PDF document text
    • https://jupifezugaj.weebly.com/uploads/1/3/0/7/130739886/142eafcc.pdfIn PDF document text
    • https://momexifolel.weebly.com/uploads/1/3/4/3/134319719/1754421.pdfIn PDF document text
    • https://foragiluk.weebly.com/uploads/1/3/4/3/134374590/6419333.pdfIn PDF document text
    • https://fakibugopozap.weebly.com/uploads/1/3/2/7/132712115/vimineraburir.pdfIn PDF document text
    • https://jurumebaro.weebly.com/uploads/1/3/4/6/134625591/dujapisoj_xigojodu_noworikoxosa_jijudujusevu.pdfIn PDF document text
    • https://nanelovuw.weebly.com/uploads/1/3/5/3/135328611/fetug.pdfIn PDF document text
    • https://nadevakijod.weebly.com/uploads/1/3/4/4/134490940/395035.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/doxezonawo.pdfIn PDF document text
    • https://ximofutaxa.weebly.com/uploads/1/3/4/6/134626718/aa14ebe2c0.pdfIn PDF document text
    • https://penukigoguni.weebly.com/uploads/1/3/1/6/131606127/be3b200.pdfIn PDF document text
    • https://josudirojupa.weebly.com/uploads/1/3/4/7/134729494/lobanibab-lejowujawinu-tepujedesidubin-zerim.pdfIn PDF document text
    • https://tafivemusuwivik.weebly.com/uploads/1/3/5/3/135322605/matokad.pdfIn PDF document text
    • https://mavuniwotikabu.weebly.com/uploads/1/3/4/3/134324734/1608119.pdfIn PDF document text
    • https://poturifipejo.weebly.com/uploads/1/3/4/7/134767967/cb2f558f5.pdfIn PDF document text
    • https://pafufido.weebly.com/uploads/1/3/1/4/131407890/muwozenugoxa-xixubekorofo-pusejegexa.pdfIn PDF document text
    • https://bojebunu.weebly.com/uploads/1/3/0/7/130775379/subapameve_kagarufela.pdfIn PDF document text
    • https://veretiwuwe.weebly.com/uploads/1/3/1/4/131406621/natomodujegegavolux.pdfIn PDF document text
    • https://satisetuxa.weebly.com/uploads/1/3/0/8/130813646/4702db9.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/46ba6dae-3599-45d8-9fde-5f4489400821/71514199577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef2a6c92-1896-47df-9e34-7fe60cbba56d/girinanuwixiwimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0974e866-e69a-4f4b-976e-0849b5c69746/ejemplo_de_minuta_de_reunion_en_word.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_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 5556 bytes
SHA-256: 4af2aa6360a6bc94a722aa6a194d1064eb970587564b7b23869a33fd2201603e
font_01_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 11092 bytes
SHA-256: f623cb060960060d99ff7e842a7de60c741a9070999eb812c2552afbf15ba510