Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3ec5367ed992a5…

MALICIOUS

PDF

66.6 KB Created: 2021-01-19 07:10:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4c1d5611cb66ad87ee5435f75336698c SHA-1: d7fa42aa3d1951b8a178b92eb15a6e10c6fe6290 SHA-256: 7d3ec5367ed992a5e57d5e52aed732416b7c9eea7afbd8863c7aacf56ee90f50
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://traffmen.ru/123?utm_term=greenbrier+middle+school+dress+code'. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. The ML classifier strongly flagged this PDF as malicious. The embedded content, though heavily obfuscated, likely serves to disguise the malicious redirector.

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://traffmen.ru/123?utm_term=greenbrier+middle+school+dress+code In PDF document text
    • https://cdn.sqhk.co/businaxidare/b6vjfha/imdb_top_movies_list_hollywood.pdfIn PDF document text
    • https://site-1174816.mozfiles.com/files/1174816/gekofemadekew.pdfIn PDF document text
    • https://site-1177159.mozfiles.com/files/1177159/foster_parent_appreciation_ideas.pdfIn PDF document text
    • https://site-1175781.mozfiles.com/files/1175781/75900653729.pdfIn PDF document text
    • https://site-1176018.mozfiles.com/files/1176018/pogs_value_ebay.pdfIn PDF document text
    • https://site-1172602.mozfiles.com/files/1172602/40961713576.pdfIn PDF document text
    • https://site-1178312.mozfiles.com/files/1178312/robirevuborixiwesepuz.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/woxewiwupir/surewiterutima.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/12576606034.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/my_boy_full_apk_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/puxexig.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/xorereges.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/botw_divine_beast_vah_rudania_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/complete_spanish_grammar_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/79883558598.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/human_digestive_system_pictures.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_off0000c755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC755 5140 bytes
SHA-256: 4af35f1a24c5f77f629445351c611365653a64c10c3680314bfcbc0c9a23a805
font_01_sfnt_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 10836 bytes
SHA-256: 7c8a299930eea9c17a467416e7e2bb84e20a4812a404a4b99c1599bdb9633b0b

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