Malicious PDF — malware analysis report

Static analysis result for SHA-256 933604ffa358aeb2…

MALICIOUS

PDF

79.1 KB Created: 2021-05-01 00:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6602dda76adb3b86c34633af6046d01c SHA-1: 69db81dac4624dad80d8b1ad011917192e4ce546 SHA-256: 933604ffa358aeb21f61b1ac2a5800a13b5079b34062062783aef66b068b70dd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or link farms, indicating a malicious intent to redirect users. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing or trojan variant. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to lead users to malicious sites, likely for phishing or malware distribution.

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://kuzutuzo.ru/strik?utm_term=why+are+the+tropics+near+the+equator PDF link annotation
    • https://cdn.sqhk.co/zipirevofu/hbrhehG/52088359025.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/paluvoduzak_wutixibagisu_nudiviwa_dakufizez.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/ihKghha/14629348945.pdfIn PDF document text
    • http://lovasosirukes.iblogger.org/mudevu.pdfIn PDF document text
    • https://cdn.sqhk.co/pogadidotilu/ZVkhhgf/33737273809.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/Tjdifii/vefuw.pdfIn PDF document text
    • http://tiketaxi.iblogger.org/fetivima.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/jd1Sidr/sadaxeboluv.pdfIn PDF document text
    • https://fabidarupevonu.weebly.com/uploads/1/3/4/6/134620419/14c5ed0a.pdfIn PDF document text
    • https://cdn.sqhk.co/loxinesupiva/UzgjrUv/83574860533.pdfIn PDF document text
    • http://rifajobabinafe.22web.org/ap_calculus_book_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/faybhad/wekibu.pdfIn PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/01850.pdfIn PDF document text
    • https://cdn.sqhk.co/wipedekis/eUFXJQi/nujamoluka.pdfIn PDF document text
    • https://mogiveruxapexi.weebly.com/uploads/1/3/0/7/130775775/fevapukeseme_zewavevubewu_futosomet_gemetasavez.pdfIn PDF document text
    • https://cdn.sqhk.co/mizipudi/hiVhf8n/28498619141.pdfIn PDF document text
    • https://pagafamowadaf.weebly.com/uploads/1/3/4/8/134878907/27cfe3023fc.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/V5KZjbr/screen_timeout_iphone_6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nezutuxomodu.epizy.com/kpmg_brand_identity_guidelines.pdfIn PDF document text
    • http://saridojuja.epizy.com/lopujovulikatilamimolulo.pdfIn PDF document text
    • http://nefigubisi.epizy.com/cromwell_property_group_sustainability_report.pdfIn PDF document text
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_2104abbed1fd40d09c4bbd3223fc3380.pdf?index=trueIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_fad50b550b1c450ca0876355c72d4e69.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_b0390eac92ea4cc0a42d20579109416a.pdf?index=trueIn 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_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 5232 bytes
SHA-256: 2ee4fca145bbfe407833302ce72ba1f63e8f8248c0cc2c773b2c78aaeae9c77c
font_01_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 11172 bytes
SHA-256: d36def60e81e8194673205ca83176fc9b8cdde746dae88bc68c3318822dfb73d