Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7de884693194bb8…

MALICIOUS

PDF

80.7 KB Created: 2020-11-17 01:22:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e720b5211023bf2a9418e494ccb4233a SHA-1: 809f10ca7ad5c8c6e19a0f04847be3d7265b1d70 SHA-256: a7de884693194bb8c48a939ca6e37ec77481b45a493d5b26f69241576df94c89
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one critical heuristic identifying it as a link farm. The primary malicious URL, 'https://trafffe.ru/strik?utm_term=expresion+y+apreciacion+artistica+juan+acha+pdf', is likely used to redirect users to a phishing or malware-hosting site. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to exploit users through a malicious document.

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://trafffe.ru/strik?utm_term=expresion+y+apreciacion+artistica+juan+acha+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394061/normal_5fa12cf416a6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5fb265ae48185.pdfIn PDF document text
    • https://nawogixabejuj.weebly.com/uploads/1/3/4/6/134617161/db5d6fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452395/normal_5fac3a0aed786.pdfIn PDF document text
    • https://tapenori.weebly.com/uploads/1/3/4/6/134657753/b8c718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382771/normal_5f9cf0a7a748e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_5f8defdcae502.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/2005422c59421.pdfIn PDF document text
    • https://funiwulew.weebly.com/uploads/1/3/2/8/132814073/59ab405a.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/2278369.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/mozirolinitaje/belujexumi.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/21095602733.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/esc_guidelines_2017_valvular_heart_disease.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/2020_calendar_printable_weekly.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 5412 bytes
SHA-256: 0fb78d01c79edc0c40ed22250b82bf70f60bcc279d8cba68484ad62cf1d0b625
font_01_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 10724 bytes
SHA-256: 746c160c20d911fde29b736cd48d3b0ce554f4d94af94ad3891a41e8c0ff57eb
font_02_sfnt_off00010d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D34 11720 bytes
SHA-256: e6eefe1a563b07feeda4eeb9e46408d66ca566a7f058d407c81ef921851ee1cc

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