Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e42630fc8362ef…

MALICIOUS

PDF

67.1 KB Created: 2020-11-11 00:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b1d815f9f7a5a727e207d2f02d7ead3a SHA-1: 56937941e56edf4b8287af410500e8f1c55db881 SHA-256: 83e42630fc8362eff2d0c4e1e834fe34b4b37e5fa253af6b2ecd34976aae0541
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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/aws?keyword=sum+column+using+awk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5f9171aaebc9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f93c05920297.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/c5f5b7d395e978.pdfIn PDF document text
    • https://zidabowejixu.weebly.com/uploads/1/3/1/1/131163559/bemetoxa.pdfIn PDF document text
    • https://mutabitobivu.weebly.com/uploads/1/3/4/6/134636436/5d05b5e0d6729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5f8d2bdb46780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_5f8da9d34f9e4.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/b5813be7-f56d-411d-a12c-85ad88f6921b/01.10_macbeth_the_power_of_words_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4a1333-35d6-4352-b110-eb9428cc0f3c/action_and_linking_verb_worksheet_pd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec330b9-4af6-4f56-afb3-b2b68f56f927/risusimivasikuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb40e05-6ec2-4cfd-9ae0-4f9153476134/pogiroxezekev.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_off0000c3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FD 5284 bytes
SHA-256: 8a7f6cb247eab02f4e95d9394796cb4adffe06b3e66a2c7a2e6ab9f6e8e063cf
font_01_sfnt_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 12420 bytes
SHA-256: 1c01db585048040042b64b38b1cef6bb5523afd34d2d48455bb5b6a7e7dfbe2e

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