Malicious PDF — malware analysis report

Static analysis result for SHA-256 5747e51eb6ee8bb8…

MALICIOUS

PDF

79.4 KB Created: 2021-01-22 14:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 395c13f65477f97e9bced06c5b5928ce SHA-1: 7a19b36ee2f6b0c896b201d2299d5bce54a2a1a7 SHA-256: 5747e51eb6ee8bb812b1be9a3e2ef7475115ad6f2645db61a72eac8c57636529
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 a URL that appears to be a lure for downloading an APK. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded link suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/123?utm_term=tower+for+tango+apk+free+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4384046/normal_5fc71aeec3a8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382965/normal_5fdc412c9976b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485450/normal_5ffc78f859da4.pdfIn PDF document text
    • https://site-1224141.mozfiles.com/files/1224141/95418980348.pdfIn PDF document text
    • https://site-1168029.mozfiles.com/files/1168029/kiguvuguxopovaku.pdfIn PDF document text
    • https://site-1178898.mozfiles.com/files/1178898/clash_royale_apk_pc_gratis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369781/normal_5fcddece7a1d5.pdfIn PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/dictionary_for_kids.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366957/normal_5ff71439bc903.pdfIn PDF document text
    • https://site-1177858.mozfiles.com/files/1177858/roredezu.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/jjSihZ7/putivewigowojarubifam.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/zinudipir/biostatistics_quiz_questions_and_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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f85d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF85D 22408 bytes
SHA-256: d62cfe91c72ef53840c1be6fe21365a7c0a05ae2f7613c5256f31f1d20deda0b
font_00_sfnt_off0000c3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E9 4876 bytes
SHA-256: 7b5d543e9efd976f9ea333c6e553aaa5dee15208e39116261ef7d8af35664693
font_01_sfnt_off0000d49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 10360 bytes
SHA-256: 246c1ebfc6755dccc2c5a9439ff4113bd96281429dfd75a1db4ceda07f03314a
font_03_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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