Malicious PDF — malware analysis report

Static analysis result for SHA-256 45553c7269710b8b…

MALICIOUS

PDF

76.5 KB Created: 2021-05-11 19:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2f47516fa213c1db0eb564673bf4dd69 SHA-1: 190dacd942aeceae0e3054f9e6f479a986bddce6 SHA-256: 45553c7269710b8be5d13c9320367eff1f2ff9edfa5c12f8553e88ced16f524f
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://maypoin.ru/strik?utm_term=d-link+dir-825+fibre+setup PDF link annotation
    • http://tiwilofojifig.sportsontheweb.net/wawopopexo.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/c5f52784.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/Rjhehhc/tinidipu.pdfIn PDF document text
    • https://furogareb.weebly.com/uploads/1/3/1/3/131397930/ec9d1b4db87e.pdfIn PDF document text
    • https://kuzapulekoxiror.weebly.com/uploads/1/3/2/6/132681507/molotubes-tozelekef-letajun-tisef.pdfIn PDF document text
    • https://voloxamofe.weebly.com/uploads/1/3/0/8/130874475/b99a3ee632237.pdfIn PDF document text
    • https://suxapenogabako.weebly.com/uploads/1/3/4/6/134602080/0cd92dea1e2.pdfIn PDF document text
    • https://kopodeju.weebly.com/uploads/1/3/1/4/131483627/6529071.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/foWLEgj/launcher_android_autoradio.pdfIn PDF document text
    • https://xakanokemuma.weebly.com/uploads/1/3/5/9/135965718/4629803.pdfIn PDF document text
    • https://fapurexetekuwud.weebly.com/uploads/1/3/4/5/134508670/33abee0e3ed01a.pdfIn PDF document text
    • https://zamikife.weebly.com/uploads/1/3/1/6/131606416/temejirelomogek-pivef-demubune.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ee347c-3a7b-4a2d-8845-ee2923d6b96e/96456431084.pdfIn PDF document text
    • http://radoletoma.epizy.com/aptitude_and_reasoning_tricks.pdfIn PDF document text
    • http://bejiteviv.epizy.com/samsung_tv_allshare_cast_android.pdfIn PDF document text
    • http://lufeneweb.epizy.com/bethune_college_admission_form_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/758823bc-4501-4cab-a26c-1e950ecc4878/pevotu.pdfIn PDF document text
    • http://jofikuv.atwebpages.com/rezov.pdfIn PDF document text
    • http://zosajirigo.rf.gd/bajada_de_cargas_y_areas_tributarias.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286fcf9d-8901-4f89-9ba4-ea24c9ff7057/rasawew.pdfIn PDF document text
    • http://sajatuvireguta.atwebpages.com/gizikixuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78c0f2ab-876b-4c55-8056-52dae98b74e1/what_is_the_next_jack_reacher_book.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_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 5512 bytes
SHA-256: a61a143cdba4781775e7944666310de7f4890756621fdfdc585ffd58ba566541
font_01_sfnt_off0000fd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 11644 bytes
SHA-256: e3c99309b8243667bd0a5fc3175cfdb7fb6e700dec2f1f303619748afd9343cc

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