Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c0668a2bc27d7b…

MALICIOUS

PDF

81.2 KB Created: 2021-05-14 08:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f55638e7c2d0bf73c2f041da5f7445da SHA-1: bb4bbc3d346f8abc394ffc1dbe1fec5fbb11c68d SHA-256: f4c0668a2bc27d7b7831c4efbcfe22c41f94358c426f39ce03acc8650b19ad00
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=honeywell+thermostat+th8320u1008+installer+setup PDF link annotation
    • https://xabetidadema.weebly.com/uploads/1/3/1/3/131398123/8187c658e1ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422897/normal_6015a2f7bf95b.pdfIn PDF document text
    • https://musazulawikale.weebly.com/uploads/1/3/5/3/135305526/panemovevejijipasowu.pdfIn PDF document text
    • https://jokenobijejadur.weebly.com/uploads/1/3/0/8/130873794/pabebapojivom.pdfIn PDF document text
    • http://tameenegypt.com/non_disclosure_agreement_template_freeizmon.pdfIn PDF document text
    • http://italiahot.space/segiwoseradittq48t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462339/normal_604509123ca16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490122/normal_6015a8d78cb99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_602b697032ef5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373788/normal_6002d997a7cdf.pdfIn PDF document text
    • http://english-10.site/how_become_a_navy_sealz99ps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_602b5d56cf47e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424349/normal_60390dfde2bc4.pdfIn PDF document text
    • https://begobaxu.weebly.com/uploads/1/3/5/3/135336669/34dd9c6a9.pdfIn PDF document text
    • https://kekiwudegabute.weebly.com/uploads/1/3/0/8/130813612/9553900.pdfIn PDF document text
    • https://talovilivakalod.weebly.com/uploads/1/3/5/3/135326419/0600739810.pdfIn PDF document text
    • https://demifezi.weebly.com/uploads/1/3/1/3/131379940/5027203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460980/normal_6009b06d44b43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_60403e85a3dc6.pdfIn PDF document text
    • http://load-bcp.com/oxford_guide_to_english_grammar_free_downloadosqku.pdfIn PDF document text
    • http://tortomsk.ru/why_is_my_trail_cam_not_taking_picturesvp1yb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368486/normal_5fcedc215ae54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bageradafasuk.rf.gd/57115144402.pdfIn PDF document text
    • http://viwukapatajomi.rf.gd/guvitaleloxevofibokuv.pdfIn PDF document text
    • http://savekuf.rf.gd/treatment_of_cardiac_arrhythmias.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 5780 bytes
SHA-256: c942f1ec66379e513eedb16f2324dd7a3a16f89c8af3ff724124ed7509e0dc1d
font_01_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 10684 bytes
SHA-256: f73e8582d49197f87031fa6247a7bee648958d865c26b5dc45d9324a675a5cf6
font_02_sfnt_off00012665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12665 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c