Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3b4624fa8f874e…

MALICIOUS

PDF

79.4 KB Created: 2021-03-24 05:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 27890d896658b6f07daa2404581c4984 SHA-1: 9ef9ef10e98bd23edc94ffeb1af064848b8419a3 SHA-256: ea3b4624fa8f874eb98a7a3778eb062e9fe28b3e54fa407a9829ec1217c13a30
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 of which are disposable and hosted on free services, indicating a link farm designed to direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=energy+kinetics+system+2000+dealers+near+me PDF link annotation
    • http://sberbank.services/safety_siren_pro_series3_radon_gas_detector_-_hs71512_by_family_safety_productsybtn7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_600da2e085343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444366/normal_6038681fd7b4f.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/pitaf.pdfIn PDF document text
    • http://xibesofene.22web.org/40585962727.pdfIn PDF document text
    • http://biomaniks.website/big_maxx_80000_btu_manualxylme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415537/normal_5febf727825f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_602ebf2b2baf4.pdfIn PDF document text
    • https://popogupu.weebly.com/uploads/1/3/1/3/131398113/vivomobagimogeboj.pdfIn PDF document text
    • https://napuximijagebi.weebly.com/uploads/1/3/4/7/134766840/zofeboragiwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421611/normal_5ff5d9a6bd030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_602eb4cd860e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_602c6dcde553a.pdfIn PDF document text
    • http://shopee24.site/jubinow8ozg7.pdfIn PDF document text
    • http://mosiruduv.22web.org/naxozekexog.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/buxafab.pdfIn PDF document text
    • http://skidki-day.shop/fagatetufiposumukirigavogcizls.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422658/normal_5ffad49c3cd32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_6051ed5d14fb6.pdfIn PDF document text
    • https://muxixeronazuxup.weebly.com/uploads/1/3/4/5/134508557/guvesumolopiranaveti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dizebumik.rf.gd/37248740941.pdfIn PDF document text
    • http://vufobaratoja.epizy.com/brahmanda_puranam_in_tamil.pdfIn PDF document text
    • http://satuwegalenez.epizy.com/saga_volume_1_review.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_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 5656 bytes
SHA-256: 720147d0aed02e685ac6e0b30e587c9c3cb229e98752a5c6e7fef33292e19088
font_01_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 11608 bytes
SHA-256: 80e2195ebbf4d73300ac5dd9ce7705cced4d6a18905a4301093b91c546637ead