Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a8b1e6df2cbc60…

MALICIOUS

PDF

66.6 KB Created: 2020-11-23 10:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ca97b103ca649b911f67f4657d1f93fd SHA-1: d46d689358dad2dfefb6c9355b034d36a0102717 SHA-256: a1a8b1e6df2cbc60031bde0dba0a0ed01e3719c699a67ebe4982de852b9ae14d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a significant number of embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a tactic to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=writing+chemical+formulas+with+polyatomic+ions+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4477162/normal_5fbac15337287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374368/normal_5f8a8b7d7a5fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483851/normal_5fb748785a472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469834/normal_5fa6a76aea48e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470412/normal_5fb328183448c.pdfIn PDF document text
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/noxejunemuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388842/normal_5f8f942ab40f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_5f8afc061d5bb.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/67e5729e-6f7a-4a7e-9757-b3b470c2eefd/vupefuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75c2e16a-0d20-4624-adea-b2723d0af18d/used_porta_bote_for_sale_craigslist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c451df-80c0-4611-9399-b0ac316ee3dd/fijetajinavuxiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44cbe434-0dba-45e1-a0ac-7f74c081209c/url_rewrite_module.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee9a0df-91dc-44b1-9d12-e2155ad1869c/fofaniliraxopojutefag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f8d8c14-835a-4a36-a46e-91bbc1295d80/polamukovepil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c8772fd-3af7-41dd-84d4-e2643c7fdce1/fagiwadafulepibezasot.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_off0000c685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC685 5700 bytes
SHA-256: 48cbf2836836bb9870d18933f7a4b4369b9ee8a80cac488d9fdcc608c99dd78d
font_01_sfnt_off0000d9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 10236 bytes
SHA-256: 1d9204d04c4f7c19c964e679d5eb18fcdd07b2d969e2fed6b15cf20212d6651b

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