Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cbcfb851e02988…

MALICIOUS

PDF

73.6 KB Created: 2020-12-28 18:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8f3a9de220f9633e9f4c1814292c69c8 SHA-1: eb2b8f919c6726ce095fbea61b441d25e712f368 SHA-256: 39cbcfb851e02988f7b5a5f12c039f06eb259832a4b3835fba14c68ef69681fa
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to suspicious or unknown domains, indicating a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://ggtraff.ru/strik. This behavior is consistent with phishing or malware distribution campaigns.

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://ggtraff.ru/strik?utm_term=best+nba+3+point+shooting+team+all+time In PDF document text
    • https://zeteparikimifol.weebly.com/uploads/1/3/1/6/131637109/furizawovalaf-gisasazobobaku-leburovew.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/b21bb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/bloons_td_battles_pc_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8dfc3e2-79db-4780-866f-13dc1f421686/arduino_final_projects.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/23097149462.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/limits_of_exponential_and_logarithmic_functions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/pisenobidivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3399a399-99ef-4214-b10f-2f0c530a2925/saxuti.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/ps2_games_for_android_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a539f4-75a1-41de-8bee-25ec8b63c237/zanurulugutovafivog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/437ba985-f4da-41ef-afec-e91b73cf8a96/munozujebetolu.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_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 5488 bytes
SHA-256: 19300040437e4abea20aa19cd1a53d0345fed839957f01a15f4b4f43a6f87271
font_01_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 10648 bytes
SHA-256: 0012fd7ed5c2cd5cd0eea1d7e695a21f6382f38e1415b0e85eba64ba02710513

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