Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2bc0b0fc9d73bd…

MALICIOUS

PDF

72.6 KB Created: 2020-12-26 12:13:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4d27fbc0b55f995813e8551df7ae77c7 SHA-1: 9439922805cbdb7972c82478eb87a927d72d33a2 SHA-256: 3c2bc0b0fc9d73bd1393f2502dff8af5b8101de8b0ea132d24de16a7cc053430
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning attempt. One of the extracted URLs, 'https://trafftec.ru/123?utm_term=movienox+hd+apk+2018', is associated with potentially malicious content. The heuristic 'SE_CLICKFIX' indicates the document may instruct users to run commands, a common social engineering tactic. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://trafftec.ru/123?utm_term=movienox+hd+apk+2018 PDF link annotation
    • https://gimifuzakid.weebly.com/uploads/1/3/4/3/134315082/4661675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_5f8eb90cd339c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_5fd381318d585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381980/normal_5f9fc0f703004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5fbb078e48909.pdfIn PDF document text
    • https://nixejovebomir.weebly.com/uploads/1/3/1/3/131380485/a0e49e08ab5b6.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/bevarolimesale/whitefish_bay_lake_of_the_woods_fishing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9f5e10-b931-4b98-b1d7-6b67c57c1a4c/lafetidabukakekatenakevev.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/livro_de_cantos_liturgicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9717521-1f7a-46f0-bc78-402162c1849a/38043070275.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/sims_4_scouting_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/100_cotton_fitted_sheet_queen.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000cca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA0 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 5456 bytes
SHA-256: 15cb4af88c1e7c6bef9ce6b9e8f6b6b9e1252e9d31acd6899a3c1e83e7f9104d
font_02_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 11004 bytes
SHA-256: e91ad790464aa845038f2b37c6cef07d1f26e5347658336a3b9a582c7fce8c7a

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