Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7c43b65f237b38…

MALICIOUS

PDF

66.5 KB Created: 2020-12-01 09:33:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7e71f8c21271e7e4be08ed66917cb8e0 SHA-1: 171de78ceb320ac33b18630fa2a2f5cf613a8432 SHA-256: 4e7c43b65f237b38bdd062e33089efd35ff2cf9e6919ffd12b8fde3cd09038eb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous external links, one of which points to a suspicious URL. The document body, though heavily obfuscated, suggests a lure related to an audiobook, likely to trick users into clicking the malicious link.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?utm_term=the+delectable+negro+audiobook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421476/normal_5f97b004496cb.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/bufedoperujulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5fb6d30cf1c28.pdfIn PDF document text
    • https://bawimadesudife.weebly.com/uploads/1/3/4/3/134363746/fimoro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393489/normal_5fc59ec58ebc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbceffe29c5e2669024a3df/1606217727263/100_oaks_movie_theater_showtimes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12af63dfdd95b60d6c240/t/5fc34b8a3c6ccf69f3c85dfe/1606634379068/all_breed_dog_grooming_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc18f8d0a2757459be7919f/t/5fc38838173fb5383b10adee/1606649913176/jobefivaxujajalilasawe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e110403f5353fd95a22f/t/5fc14a8deaf37e3b64cbb099/1606503055261/72815134437.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0ff5fa04221c71e83a63/1606291446340/prayer_of_confession_racism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8405d70d-235a-4e43-bfee-6feb7dcfb1e3/64200517847.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_off0000c7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E6 5176 bytes
SHA-256: 6dd6e8ea10417b187a5362ac86943b7b693582e13dbd6327236508e34bf648b1
font_01_sfnt_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 10512 bytes
SHA-256: a25f8003aa2a0db5221dd4cbb58944723a78b868a0f2f4bc302230f41a7bd9c2

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