Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c8e2b4b86244f2…

MALICIOUS

PDF

72.9 KB Created: 2021-03-04 06:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 99e8299760c4197d3db0579e2ea01aee SHA-1: 44d515885b218fbdcdba0bd336f103b1152d8730 SHA-256: 48c8e2b4b86244f2269ee28a39aae36f8dbf9d283d9a3a247be8e1420fbfbbda
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically leading to a domain associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting. No scripts were extracted, but the presence of numerous external URIs suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=how+do+i+check+reading+level+in+word PDF link annotation
    • http://newipufisatag.scienceontheweb.net/how_do_you_unclog_a_hoover_windtunnel_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_6011518b935c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5ff955fe6c3b8.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/89383133220.pdfIn PDF document text
    • https://motabuwupogofe.weebly.com/uploads/1/3/1/6/131607229/1543109.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/mens_health_workout_routines.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/powerful_intercessory_prayer_requests.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415308/normal_5fe308e7e8927.pdfIn PDF document text
    • http://sazulido.medianewsonline.com/10998738280.pdfIn PDF document text
    • https://cdn.sqhk.co/telazaje/gfKgfhj/81770123231.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/aplikasi_anti_malware_terbaik_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/netgear_aircard_smart_cradle_manual.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/how_do_waves_affect_the_shape_of_the_coastline.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_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 5200 bytes
SHA-256: 2c685ab6bc618fa96a849e335d770da0f0b42e91c39b45a6dc55b5c4b816588d
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 10436 bytes
SHA-256: 37595434c9385ae6976c3e4d8b11eb19719735e9506396d21f3bb084a7aecdeb

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