Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe41541703a4ea1…

MALICIOUS

PDF

71.3 KB Created: 2021-02-16 08:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1703b67af45a80ab4bffec336a1b9b4b SHA-1: 0286e41a467a788e29957ba2a1945aeaea475d50 SHA-256: dfe41541703a4ea13bf2d9af0e5c003af97484c9e4b0bd0b04ab29c27637bc78
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 'https://yafferge.ru/wb?keyword=how%20to%20ignore%20a%20guy'. This URL is the primary indicator of malicious intent, suggesting a phishing or malware delivery attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient to infer a phishing or redirection attack pattern.

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://yafferge.ru/wb?keyword=how%20to%20ignore%20a%20guy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_601f34f3727ad.pdfIn PDF document text
    • http://dopenukivo.22web.org/xurogiberu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_6015eb963574d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_600bfdb77ff07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482215/normal_5fe16fa29a781.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/jivala/send_anonymous_sms_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/lupav.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/61031537304.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/informal_balance_art_definition.pdfIn PDF document text
    • http://junedujivoxoz.epizy.com/march_madness_bracket_blank_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/hokey_cokey_free_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/atheros_wireless_lan_driver.pdfIn PDF document text
    • http://supitemev.rf.gd/25991926728.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/78704278775.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/english_essay_writing_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/singular_plural_nouns_worksheets_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/91714320402.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_off0000db96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB96 5080 bytes
SHA-256: e094c93379713ff1cc73450a90e21824d11387aa1ef561291851a82e5bac72ad
font_01_sfnt_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 10256 bytes
SHA-256: 3c2fe9ffc0bedf7d840bf6301a791e7956509eb40cdd8b40a566045f281915cc

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