Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a1c06e54df5aad…

MALICIOUS

PDF

76.3 KB Created: 2021-01-16 22:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f1f0321589ad4c8b325f7da854ede9e8 SHA-1: 75296a309b04603562ec7b5c6f998ab4ada1127e SHA-256: f1a1c06e54df5aad70bae45907d8f900899d08f33eb99f72ec07c93d54cd9cf8
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a PDF link farm designed to redirect users to malicious infrastructure. The primary redirector URL is associated with known malicious activity. While no scripts were extracted, the presence of multiple external links and the ClamAV detection strongly suggest a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffking.ru/123?utm_term=arduino+3d+printer+shield In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_5fa3e77e00fe0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458144/normal_5ff65717c402d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_5fb3f238a5446.pdfIn PDF document text
    • https://site-1177444.mozfiles.com/files/1177444/kaxapikina.pdfIn PDF document text
    • https://site-1176438.mozfiles.com/files/1176438/bio_war_zombie_army_trilogy_virus_survival_kit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491945/normal_5fdae6a0d4083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f86fa2456802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5f9dbc6656dd0.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/fd57c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408188/normal_5ff2790f4aa03.pdfIn PDF document text
    • https://jozinuzo.weebly.com/uploads/1/3/2/7/132712000/jukewulu-negejubefi-dadutolilanava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kopisigapub/my_education_city_login.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/54212085423.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 4872 bytes
SHA-256: c3fcf1a3ad176f62c431f4694c3ad35fa09394d53306998163ac0befaaf4d42a
font_01_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 10280 bytes
SHA-256: 5438afdb52b8b39d4297fa31c121f289c98ef1fcd15843bf22f481a08fc0d2f3
font_02_sfnt_off0001165a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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