Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cb1f8a62bd527d…

MALICIOUS

PDF

79.5 KB Created: 2021-05-08 12:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b3662bd22fe03a233f30f586423c0ea2 SHA-1: 54c7761c47702ae029ba612d062ba8a8d920c1c1 SHA-256: 10cb1f8a62bd527d1deaf45230543d9c47a4045431d35edae34cd55310598224
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=list+of+sins+in+the+bible+kjv PDF link annotation
    • https://cdn.sqhk.co/dodipenameki/hcLuhc9/bipedageramusafapumum.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/rjfggjb/the_manager_in_spanish.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/tixumagorawukavituvorofi.pdfIn PDF document text
    • http://suvekitubexeso.getenjoyment.net/modern_textbook_of_zoology_vertebrates_free_download.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/13140730247.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/hdicjck/32436503175.pdfIn PDF document text
    • https://kevofogag.weebly.com/uploads/1/3/5/9/135962027/mifupegi.pdfIn PDF document text
    • http://tagoturuluro.medianewsonline.com/canzoniere_napoletano_accordi.pdfIn PDF document text
    • https://viberizenuge.weebly.com/uploads/1/3/1/8/131857204/1473269.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/5368180.pdfIn PDF document text
    • https://mafupixalikufu.weebly.com/uploads/1/3/4/6/134662523/zamepepadawulawave.pdfIn PDF document text
    • https://vabikepopuf.weebly.com/uploads/1/3/2/3/132303012/poketivu.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/82828812478.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/jfjejdx/83448379146.pdfIn PDF document text
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/8904882.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/lijopavexanuse/yo_te_amo_in_english.pdfIn PDF document text
    • https://2ac8321c-28d8-41c8-ac7a-99137a6fe030.filesusr.com/ugd/157ee0_29074e33f118479b8d55002aa8ec9f5f.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_fccdcb5be8214fd3a0809f3485be5636.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/nordictrack_elite_5700_reset_button.pdfIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_d7a43c74709b48d5949a32e571f0ded7.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_e3b96ba029ad4b50aec4e6925408ff36.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/18441498796.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/aaru_tamil_movie_ringtone_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/43341069353.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_off0000fb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB54 4832 bytes
SHA-256: 4ced25a9e9006adfc040ce967e5ef2e2de47c2b4e4a1a0150b5536cf71bd6b1d
font_01_sfnt_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 10824 bytes
SHA-256: 8d38748132698e751ee47ae1b0301aea8a131affeec711b96ed398162d3f0e68