Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4576b81e3542b4b…

MALICIOUS

PDF

79.2 KB Created: 2021-03-28 18:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6f62830ce78d749f67d99492ddd0e537 SHA-1: 282b0766ed6f58a58980996143e669d4b1216fce SHA-256: f4576b81e3542b4bd24c794edc5f333a5dbb502c23fea5ced4d057ff86b29799
156 Risk Score

Malware Insights

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

The PDF file contains a link farm and a suspicious URL, suggesting it is designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content-luring attack.

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://jacksth.ru/strik?utm_term=why+is+my+whirlpool+fridge+not+cold+enough PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393515/normal_600d86b60d399.pdfIn PDF document text
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/fovixazamemubirera.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/uhbjiij/heroics_definition_business.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417039/normal_60591cf26d00f.pdfIn PDF document text
    • https://jotukodapoze.weebly.com/uploads/1/3/4/6/134632246/1312244.pdfIn PDF document text
    • http://xenotobewaf.22web.org/47528096579.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/ijcgiie/mivoxezubi.pdfIn PDF document text
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/549300.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/xetasif/turnigy_9x_frsky_module.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/amd_adrenalin_drivers_18._3._4.pdfIn PDF document text
    • http://boribasumagit.epizy.com/42511284128.pdfIn PDF document text
    • http://jibubifo.rf.gd/52647716677.pdfIn PDF document text
    • http://sejofepoga.epizy.com/reaction_of_aldehydes_and_ketones_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/ethiopia_disaster_risk_management_policy.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/what_does_atypical_cells_in_a_mole_biopsy_mean.pdfIn PDF document text
    • http://varoniwarovez.rf.gd/nauka_angielskiego_aplikacja_android.pdfIn PDF document text
    • http://wevikokuzufos.epizy.com/thunder_cake_book_characters.pdfIn PDF document text
    • http://selitesavuweg.epizy.com/kanuzelikilix.pdfIn PDF document text
    • http://wozadubokurego.epizy.com/how_to_convert_j_mol_to_j_g.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_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 5568 bytes
SHA-256: 30651509c5bf4dfce233fa91615d20312d741a411c955670cf67551d3353c162
font_01_sfnt_off00010946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 11288 bytes
SHA-256: ec7b281b798d5763a944656dc3c127f1b1697facaf9713583a2e50b09bf05721

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