Malicious PDF — malware analysis report

Static analysis result for SHA-256 b143a52000856752…

MALICIOUS

PDF

76.6 KB Created: 2021-05-16 14:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b3c0b43e27791fab9ad9388485157ad8 SHA-1: 46dfa0ffe43c3f4c1e65dceb6033186330239689 SHA-256: b143a52000856752cd6472b1f250974c30ca81d95660734bc784f4e87a0dcf8a
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a phrase related to 'safe haven security customer service number', which is likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=safe+haven+security+customer+service+number PDF link annotation
    • http://jeruwit.mygamesonline.org/laxowelisodisal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404753/normal_5fce481c46752.pdfIn PDF document text
    • https://cdn.sqhk.co/laloropaki/fIhbU63/crossy_scapes_2020.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/7012285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_603fe99be3454.pdfIn PDF document text
    • https://jewepixixa.weebly.com/uploads/1/3/0/8/130814248/0d3e9b36f2.pdfIn PDF document text
    • https://juxipidupe.weebly.com/uploads/1/3/4/6/134694928/zodedapo-widiv.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/gRiimGs/pelijegi.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/LhckPQj/hd_wallpapers_1080p_for_pc_pubg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453328/normal_601bd09b2f90e.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/hMeidC4/rokebupetoj.pdfIn PDF document text
    • http://sijiwepi.mypressonline.com/augusto_dos_anjos_em.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_601b444d1c5eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_c20e5ee4445648349700e5123963c479.pdf?index=trueIn PDF document text
    • http://xamunenefo.rf.gd/49965360095.pdfIn PDF document text
    • https://5563968e-3cf5-463b-8312-7915ab8a4794.filesusr.com/ugd/cd90d1_93c81814c5024013bc17d5fb58e12521.pdf?index=trueIn PDF document text
    • http://vawinujofupin.myartsonline.com/tricks_to_solve_blood_relation_questions.pdfIn PDF document text
    • http://ripizidogiga.rf.gd/why_doesnt_my_washer_drain_completely.pdfIn PDF document text
    • http://dawejur.atwebpages.com/kovimekobop.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_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 5496 bytes
SHA-256: 779d6efa816c34fbcd9050a9f0e4c4b38218e09099345df939221e5cedc4255a
font_01_sfnt_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 11340 bytes
SHA-256: c42c8eca86df76ac55dce49f959f1e86add5abdeb60ff4a44bd471143ce3a6cc

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