Malicious PDF — malware analysis report

Static analysis result for SHA-256 d760b3185cdeab17…

MALICIOUS

PDF

69.5 KB Created: 2020-12-16 13:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: fc86103619a3f5c76095a5b81967a38e SHA-1: d75241105a830070dcbf6530f4753886d4a35734 SHA-256: d760b3185cdeab177683e73726715f7fa2950fdbcd81e0e4e3d70c31d89a81cb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffe.ru/strik?utm_term=logic+iq+test+questions+with+answers+pdf PDF link annotation
    • https://teretusux.weebly.com/uploads/1/3/4/6/134687242/lazik.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/5fc588470b6b03258f54bdbe/t/5fc987932e4d7f67ca2192bb/1607042965945/motogp_schedule_no_spoilers.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/99645330151.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/rexufapakamiki.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/60114007985.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/fogelir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/540b983a-5909-4748-a913-aefc82c91dea/45186959038.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/69055903672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df33f46-6197-4e83-ab29-fa133d1e1e31/13407462025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd6a8eb7-ac6c-4350-aaf4-a2d2154c3c31/vanoguvetawukaxafox.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/comparing_fractions_worksheet_fourth_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/jizifukenipud.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/34866877695.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_off0000d219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD219 5544 bytes
SHA-256: e93b888c390a5d16cbaf8f6dffd7c63070a5090e353e5112fd133c853f871650
font_01_sfnt_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 10696 bytes
SHA-256: 03b711eea0ca230eb3610beb216aa7395653984f3fb532985068a7deeb4b4807

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