Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37852495ddf2b46…

MALICIOUS

PDF

62.8 KB Created: 2020-11-25 10:58:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2a6be09588b36820afe419921f09f94 SHA-1: d0fcbf8e4f672a84e7f2d2691323d672a61dfb41 SHA-256: b37852495ddf2b466ac97f562376289e651b7506d27a7fd382f38da3a72622cd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of techniques used to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/strik?utm_term=molarity+and+solution+stoichiometry+worksheet
    • https://cdn-cms.f-static.net/uploads/4474170/normal_5fb34d6b1797e.pdf
    • https://zisikokemebekus.weebly.com/uploads/1/3/4/2/134235681/9a82ef20fb82ec.pdf
    • https://cdn-cms.f-static.net/uploads/4443802/normal_5fb4261ac70e8.pdf
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/devowunoz_viwoz.pdf
    • https://cdn-cms.f-static.net/uploads/4415756/normal_5f9e6a6ce4128.pdf
    • https://jafakafewubili.weebly.com/uploads/1/3/4/3/134397715/2a50c60f91bc3.pdf
    • https://zebamejiwan.weebly.com/uploads/1/3/4/3/134312785/47b8ee.pdf
    • https://dodupezuvu.weebly.com/uploads/1/3/4/4/134443873/383b30.pdf
    • https://vakuvovigoder.weebly.com/uploads/1/3/4/4/134467198/titilidivijese.pdf
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5f9c0c704f697.pdf
    • https://cdn-cms.f-static.net/uploads/4462982/normal_5fa1c20f13da9.pdf
    • https://fosozenasavo.weebly.com/uploads/1/3/4/8/134889966/fopewamamarupe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3b6b225e-df64-46c6-ad31-376e2e24d10c/harbor_breeze_avian_fan_manual.pdf
    • https://uploads.strikinglycdn.com/files/86ddd06a-b08b-47c7-a40f-a7d3e9c1f355/petsafe_wireless_pet_containment_system_instructions.pdf
    • https://uploads.strikinglycdn.com/files/3bf3514d-bbf2-4257-ac25-2777a31bc536/kolotajibuwozofobux.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_off0000b66f.bin
5d1e3eaea9f86fc3c829778890a54e59a0ed349265665c98d20fcdf06fa8c0ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xB66F 5440 bytes
font_01_sfnt_off0000c8e6.bin
1095ea711a275330f94423ec31456576dd68eb0d35aca49f9189710e02443798
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E6 10320 bytes