Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8673929dcb75ccc…

MALICIOUS

PDF

73.5 KB Created: 2021-06-10 08:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 93b96096de47dca8aef73da7a9b5ef0a SHA-1: 549ee1b77491fda77f464afc54ddc6df58b0494a SHA-256: d8673929dcb75ccc6e9a1faa91e715191228cce5bf09f1bfd7ad33c833df0202
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a phishing lure disguised as a movie download source.

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://krisoc.ru/pbw?utm_term=hollywood+full+movie+tamil+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446147/normal_6061be6949c3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453332/normal_6050734bd60e4.pdfIn PDF document text
    • https://zimivopup.weebly.com/uploads/1/3/1/3/131381614/7285386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502817/normal_604932062fe1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416131/normal_5fc9f2d51822e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_60bc51f685314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_601ce12bb4926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_6035bccfc817c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417814/normal_6043f8679949b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445739/normal_6037486f010ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_601f11beeee52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_606bc5b392c77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454170/normal_600b2455656d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495271/normal_60467048566ff.pdfIn PDF document text
    • https://zarokosa.weebly.com/uploads/1/3/5/3/135300057/bomuja_sanikoxalobelep_biralazo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424696/normal_5ff387ca2e1d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_603c0c413a92b.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/05a4fad3-d46c-4d5e-abd7-1d072b8d7d04/39403113200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9101b238-d967-4da3-ba09-703e5dcbb29f/nituzaze.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_off0000e283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 4996 bytes
SHA-256: 57f8f9776b352875f398a01aa1d9bc64aa486973d5bff69d0d5cd1c91faf4256
font_01_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 10740 bytes
SHA-256: c3fdfc1bf2619476cfa384b5b54bf86c540bd9a6a2c0be336b254b2bb791cd82

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