Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff14c8e9d98551f…

MALICIOUS

PDF

70.6 KB Created: 2021-02-24 09:48:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3e072407c08b01f654e2c34d80b3a778 SHA-1: 9cb7a49bd37bde8ee1f5e757256e6d5d252e96dc SHA-256: dff14c8e9d98551fff2a4675728fd278054a45d2cf80c25fbf226888f80e1f2b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a suspicious domain ('baarspo.ru') that is likely used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=stocks+and+shares+for+beginners+books PDF link annotation
    • https://suzexefovewav.weebly.com/uploads/1/3/4/6/134640410/fofuwapubi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380536/normal_5ff56a3549a71.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/259219.pdfIn PDF document text
    • http://50offstore.info/cause_and_effect_diagram_template_freeelaom.pdfIn PDF document text
    • https://rulafusojuxibaw.weebly.com/uploads/1/3/4/2/134265871/e656d5522f54cf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501214/normal_60039ad220517.pdfIn PDF document text
    • https://belanuxaru.weebly.com/uploads/1/3/4/6/134670531/xezof.pdfIn PDF document text
    • https://jadowusirufire.weebly.com/uploads/1/3/2/7/132740355/9104252.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5fdeffb04a339.pdfIn PDF document text
    • https://bobilemako.weebly.com/uploads/1/3/4/7/134733435/wiwokinubagoxexerog.pdfIn PDF document text
    • http://muzoc.xyz/the_little_girl_and_the_wolffvl4z.pdfIn PDF document text
    • http://soinjaga.ru/9147497720391h4k.pdfIn PDF document text
    • https://nijomusuvul.weebly.com/uploads/1/3/4/6/134671469/tifen.pdfIn PDF document text
    • https://zapedumukovig.weebly.com/uploads/1/3/0/7/130775012/8d992deedb459b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_60164386cd007.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/wazagidonux/nemirabog.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/basic_emotions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/20032236383.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/3d_bed_sheets_china.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_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 5560 bytes
SHA-256: e601faf09b1895ed1896ded076356ac06e3ad9f85a0303f4088aa0a135a8a652
font_01_sfnt_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 11080 bytes
SHA-256: b76518b6213c557c96f458c772d47577482676fad4e3944dadb65f4677dedb9a

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