Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd101171c008e280…

MALICIOUS

PDF

78.7 KB Created: 2020-12-18 08:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 204582854c198c054283540fd4a597b6 SHA-1: 5dacfca673aa0d602db6e72a44042d3dbb4b0ffd SHA-256: fd101171c008e280c2898449ad1502234c8d74c2b4e9f062f752d057288f94f5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ggtraff.ru'. This URL is likely used to host or redirect to a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Equations with fractions' and 'wkhtmltopdf', suggesting a lure to disguise the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=equations+with+fractions In PDF document text
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/fikexumuk-todetowagu-gizagofi.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/sipukepovowova_tutevur.pdfIn PDF document text
    • https://welavofewefose.weebly.com/uploads/1/3/0/8/130813025/4325952.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/5822801.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/rijaliwiguvex/puzivemasudubi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c991c6d9645836219624/t/5fc2e3d24e98326c0270783e/1606607828799/wijidifuzesagikup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474b4b23-405d-47db-b8f7-cf1e580c972d/88864782548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5a51f1-c30c-4464-a3c7-ee7384ffce78/mofikisomelowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b247d5e-6371-4e51-98da-6a659ac92bbf/download_mod_apk_subway_surf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c9b1a5bc066edfa528b7/t/5fc20c24bc819f1cf41fe834/1606552613430/zofimepa.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/2d_arrays_java.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f827c515-5686-4e86-825b-5a27fc5c802c/tiduwaguvipuminik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297f6e49-341e-4a48-8314-3f8c993e9e00/12639177612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67841c72-95b5-486b-83ce-cd03ba148840/transmission_of_human_traits_worksheet_answers.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_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 3008 bytes
SHA-256: 7018e4a07af449e66d8c119c8cc4a6c69c507be81e449d642bd64407fd155910
font_01_sfnt_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 5112 bytes
SHA-256: b6eee076a285b7beac2379cdcc38c33c9e5703b48d140bf1110ab455fed4c2ad
font_02_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 11024 bytes
SHA-256: 18f0dfc1b891498c427040d677d872650dd6138fa445574a01f4c181e72b86ad

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