Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e152fde84be041…

MALICIOUS

PDF

64.0 KB Created: 2020-11-29 22:21:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0281af614ea830e14fed7bdd33743de3 SHA-1: d3f39406464c36b67963dd60bae5a2e9b5ff7841 SHA-256: 70e152fde84be0412f9f6324db8e4d1b2165c210ea345eebb89e491fe11f1377
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to redirector infrastructure and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=do+no+harm+documentary
    • https://cdn-cms.f-static.net/uploads/4373797/normal_5f8a078a7776e.pdf
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/6892364.pdf
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5fbba5af95f0d.pdf
    • https://zosubidam.weebly.com/uploads/1/3/4/3/134316114/8378052.pdf
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5f88c1fd13245.pdf
    • https://cdn-cms.f-static.net/uploads/4419218/normal_5fb724abca423.pdf
    • https://nawitesusamu.weebly.com/uploads/1/3/4/4/134480899/996ddb029323f2.pdf
    • https://tojemiwavujiguv.weebly.com/uploads/1/3/4/4/134468879/dasisu.pdf
    • https://cdn-cms.f-static.net/uploads/4420905/normal_5fa7ee19b4b0e.pdf
    • https://cdn-cms.f-static.net/uploads/4410027/normal_5f9890cbf3ba2.pdf
    • https://gobitinu.weebly.com/uploads/1/3/4/9/134902795/7193607.pdf
    • https://cdn-cms.f-static.net/uploads/4443588/normal_5fb40f154fba4.pdf
    • https://cdn-cms.f-static.net/uploads/4416128/normal_5fa87e963c33a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cfd3ba46-6347-411c-99ee-eec0a59a78c6/physics_walker_4th_edition_solutions.pdf
    • https://s3.amazonaws.com/sebunuzu/68003006516.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be67.bin
3254791a2e1dc4a3e6a3f31e20b8b0ad2ca8e9ffff585d2ccffb09d5bd43cb43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE67 5068 bytes
font_01_sfnt_off0000cf86.bin
a8325d84d4925eb32c59f1caa2faa5d9b7d38a44a83ec3ff8d937b9eaf03b5e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 10436 bytes

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