Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1596c3093e508d…

MALICIOUS

PDF

83.6 KB Created: 2021-05-26 15:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fa9f8b8448c72f0b758c6a61ad00b652 SHA-1: 86b4769f5d406d0d9736361ea24b0fb6ccc808ca SHA-256: 7c1596c3093e508dc843c94f352a1ac2f98fb57054ff2a1210bc6f86e1eb52a8
156 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 other PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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 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://druttle.ru/strik?utm_term=how+to+block+someone+on+spotify+app PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454678/normal_5ffa7ccf823c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5fdd32c5c3e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_6045e3fbba331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_603020567fe20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420765/normal_606378547fce8.pdfIn PDF document text
    • https://vazewelekataba.weebly.com/uploads/1/3/1/6/131606588/pipexitu-pizuzubere-zusajuzigelir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_600ca6fd7adb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_601e78eecf9d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450438/normal_5fd1991c30ad5.pdfIn PDF document text
    • https://nagifinapu.weebly.com/uploads/1/3/2/6/132696111/f93229464d64359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_60661b610ac67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_603f3782468ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_601cfdfcd5929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_6018e4cf95d9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481157/normal_5fde2d9ab232b.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/195e022d-9330-48b4-8d64-b9fc5eeb972e/51027480515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ebdf9b-efac-4389-900a-ddb8dfb04aac/rimesoxexita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b09cc7-a265-4c28-b5a2-5bd7d6f14f21/96412122543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff23a61b-11d6-4519-bb07-e9956efdea4c/how_to_set_up_a_hamilton_beach_steamer.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_off0001083b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083B 5424 bytes
SHA-256: f35d6fb54dacb48689d6c3dc70d40d84ba4c762fd18ff8e4b0f1ef117470bc4d
font_01_sfnt_off00011aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 11340 bytes
SHA-256: ab60a7ddada33ecec2e7abf8bc425395f41f0f09c26c7f07e3c13349b4024ac7

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