Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c1cef5b073aabd…

MALICIOUS

PDF

89.9 KB Created: 2021-01-09 14:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d34757f1a98c51bcdf0f78f9cb63d04f SHA-1: f1fdc05976464082988d914482e25ce13295aaed SHA-256: 77c1cef5b073aabda28d2cce821959638cacd973e7b10b6f2f7878c37993f391
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains numerous embedded links, many of which point to known malicious redirectors or link farms designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF structure suggest an attempt to exploit users by directing them to harmful content.

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://gettraff.ru/123?utm_term=free+eligibility+worker+exam+study+guide In PDF document text
    • https://cdn.sqhk.co/modebopogut/POQidij/super_mario_run_download_game.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/sepusibofekabe-muzik-wetevawipomu-lulopiwuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450721/normal_5fa4facb14d95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459483/normal_5fa0f2550c0e2.pdfIn PDF document text
    • https://cdn.sqhk.co/xunalafugapa/ggfhert/tunnel_rush_2_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/f7vMhil/madadurelij.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/rijudadubawif.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/9iaaFTn/coda_meetings_portland_maine.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/dih8giH/nemevovusazimosudomibu.pdfIn PDF document text
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/78094.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/wavunot/mababosoba.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/77787131407.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_off00011549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 5344 bytes
SHA-256: 88fbc65293fdb7ece8a1ca70d2bd69ac923feeb6ef91797ea3c66c5265d40e94
font_01_sfnt_off0001278f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278F 10980 bytes
SHA-256: 53dc098533c7b713ba65227323c5ae53a96a16a7013a6191c4b5a1a64011a665
font_02_sfnt_off00014c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C76 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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