Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d0e16f386b91fe…

MALICIOUS

PDF

77.5 KB Created: 2021-05-02 06:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ff9671c40a56a259a6f673ba0471a02f SHA-1: 7883378440fdb8fe55f659d38b9180c30b4d2980 SHA-256: b0d0e16f386b91fe2473c75dc494ba4bd08c1d0e833ecf178c06f9ac8a4134a3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with 'https://midufefew.ru/strik?utm_term=solucionario+mecanica+vectorial+para+ingenieros+dinamica+6+edicion+pdf' and 'http://zomosidotewe.sportsontheweb.net/bbc_janala_english_learning_book_02_free_download.pdf' being prominent examples. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable domains, likely for SEO poisoning or to distribute malware. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a trojan suggest it may attempt to download and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=solucionario+mecanica+vectorial+para+ingenieros+dinamica+6+edicion+pdf PDF link annotation
    • http://zomosidotewe.sportsontheweb.net/bbc_janala_english_learning_book_02_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_5fe9b1d1bb040.pdfIn PDF document text
    • https://kowadesilokawu.weebly.com/uploads/1/3/4/2/134265693/67330c.pdfIn PDF document text
    • http://samafutanub.mypressonline.com/64033331078.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/pukigo-nexulafojizokev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459468/normal_6046b37a4087c.pdfIn PDF document text
    • http://nubilofanekib.mygamesonline.org/xivapaniko.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/96960495178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453907/normal_6039262e53829.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/dinike.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426550/normal_5ff5de9507252.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/7a88c069-d12d-49b0-a3c4-a2ec3d7f0097/15709012900.pdfIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/belgic_confession.pdfIn PDF document text
    • https://3350d16e-2476-487b-844f-3942c02081ad.filesusr.com/ugd/25270e_bad2c37fe43a441db6a997a839b06468.pdf?index=trueIn PDF document text
    • http://pudolajuji.atwebpages.com/baseline_survey_report.pdfIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_65ba598d2190427a99d98e262abbfd93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1fe257d-ce84-4cef-96ce-d7301c75e92a/dagekizobejidiposoludu.pdfIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_677852ab40ca4a0bac211c9722615004.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_33efc4bb6f0e484591b1a87d423943e6.pdf?index=trueIn 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_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 5792 bytes
SHA-256: d2ea19c4ac938df9b637fd00a9b7faa9301d433ba965d650c5da074b957b8577
font_01_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 11388 bytes
SHA-256: ad1725ed0b22ed30c6e8fd79707f9716e08e4080f8bb280a9014bddb7023f64c

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