Malicious PDF — malware analysis report

Static analysis result for SHA-256 1531af259767f465…

MALICIOUS

PDF

161.5 KB Created: 2021-03-16 07:12:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: db82ff572782546720085fb48904240d SHA-1: 5fb3ece9b0b87e3fea5e7cf5b06e1374eaed1ae9 SHA-256: 1531af259767f4654e2eff3421e54565c76996e0d5adc09c8a8f2b1e8e1018a9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure strongly suggest it's designed to redirect users to potentially harmful sites.

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://botokaw.ru/strik?utm_term=water+by+the+spoonful+characters PDF link annotation
    • http://regse.website/carbide_create_softwarey2hoa.pdfIn PDF document text
    • http://world-wildshop.com/954974123920ad5z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453563/normal_5feb0690bb996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504839/normal_604206e0a02d0.pdfIn PDF document text
    • http://govnosiakxws.online/95802064411cfot8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rovosaba.rf.gd/latitude_7480_spec_sheet.pdfIn PDF document text
    • http://gezugedabupi.epizy.com/rifebuforupexojovituzoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/398d6e00-97d4-4a4c-bbce-5975be154ec1/fiwujimutofatevubibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef777c3b-9417-49ea-a078-c28f55e710c3/viking_range_repair_atlanta.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/coraline_sheets_wickes.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/nivarad.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/self_certification_form_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3925ee63-5e0a-4c2d-ae3a-a70e74ccbbd7/44332484909.pdfIn PDF document text
    • http://patudesaruvob.atwebpages.com/asthma_action_plan_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0becf4b-d98b-47d1-82d8-d67a7176c1e8/how_to_get_bill_of_sale_form_dmv.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/monivolepizadelalogozibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5e4a6f-3184-4d7b-bc84-2a21567952ae/kozowuwanexovowaxe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22896 5696 bytes
SHA-256: 6203de9d6480b01aa6d9a7668887825a66b1fd60680a61e450e8620f22e84e1f
font_01_sfnt_off00023c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C83 5360 bytes
SHA-256: 435a12893b4ae9a4318bb6e91c11db4986c3490886fb81b555069193f43cfce3
font_02_sfnt_off00024ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24EC7 12248 bytes
SHA-256: f106afaf4dddb0dd847216bc003f2be6da6b03c9853e239e442cc4f35ec8ae7d

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