Malicious PDF — malware analysis report

Static analysis result for SHA-256 819b85bd7b03198c…

MALICIOUS

PDF

87.7 KB Created: 2021-05-28 00:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4ecbe32c5e2fa6521a7bd58c30cfa1e3 SHA-1: 91e277827508b91e48257f18206ceccb43c47e52 SHA-256: 819b85bd7b03198cc072f8068ffd1e7571bc0cae01669ed5c9929e99b901fc68
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://botokaw.ru/strik?utm_term=ejercicios+de+ecuaciones+quimicas+para+balancear+por+redox PDF link annotation
    • https://vuvunovugigadi.weebly.com/uploads/1/3/0/8/130814714/bovowakej-resabete-zufuruju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418185/normal_602ef7776cca0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_60153d3fe4e85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_60378f9be7338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_60563415ac39a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_606c441866301.pdfIn PDF document text
    • https://siridadujaxata.weebly.com/uploads/1/3/0/9/130969300/zogowuwavikefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465393/normal_5fd17f1d2539e.pdfIn PDF document text
    • https://wigimosasalak.weebly.com/uploads/1/3/2/8/132814057/9612347.pdfIn PDF document text
    • https://kufojinelimipi.weebly.com/uploads/1/3/0/7/130776518/3371798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_60208a008d499.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444875/normal_60029a7737930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_602268f17c902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_606ad55039c57.pdfIn PDF document text
    • https://mimatetozolo.weebly.com/uploads/1/3/4/7/134707120/68e1a0d900bbb.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/545aac48-9c13-45db-888f-e3395c3080d2/vubutizeligudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9adfd668-d108-41ac-a85f-df19f5c47472/sony_bdp-s570_software_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9105fe2f-9030-46fb-a7a0-e532ae0e854b/77103276755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80095fae-e8e7-4583-b68c-a77f9e3ab476/what_gpa_do_you_need_to_get_into_cu_boulder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6bd049-c1fc-47b4-870e-9da0cdb33941/5e_brutal_critical_greatsword.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ad7a9e-8319-4365-931d-5c95116b34d4/xitigirilusoletusaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/782e5dc8-4492-403a-a213-8794673b9e32/present_perfect_tense_of_the_word_listen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287aa8c3-5c72-425e-81bb-dc0b1df8202a/dillon_650_for_sale_craigslist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c4a2b1-7ebc-43f1-99be-ed3b40559a5a/zulezopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ebfa968-950c-4e21-80d2-78838519f296/ranetedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9695cf78-277e-461f-94c1-323dd483e93f/4815561924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d1fea07-7aac-48dd-9527-d7a186f3e89f/past_present_future_tense_verbs_anchor_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/111fffff-ceb5-4e46-8adc-c459a20728e9/vilupavolimurazuvi.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_off00011171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 5588 bytes
SHA-256: 321de7cd81f5e812bb81a683d863cbd9d05edfa345ceef832f720b0020f80bf3
font_01_sfnt_off00012456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 13044 bytes
SHA-256: 77c3e497743c4231866247c93de112b9aa96d4999c82043c2935a72405db54f0

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