Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8bdc8041c7e6b0…

MALICIOUS

PDF

70.5 KB Created: 2021-02-14 15:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3d88607aaa02bc741f96ab0ad21ee0a5 SHA-1: ff8443a2b588d336065387184643b4f397ab1efb SHA-256: fb8bdc8041c7e6b0bb0b70f09464712189473c7a514787a595e465c0d950eba3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a potential link farm. One prominent URL, 'https://crophysi.ru/123?utm_term=sepm+version+upgrade', suggests a lure related to software updates. While no scripts were directly extracted, the PDF structure and the presence of many external links indicate a malicious intent, likely for phishing or SEO spam, aligning with the ClamAV detection of 'Pdf.Phishing.Trojan'.

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://crophysi.ru/123?utm_term=sepm+version+upgrade PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408464/normal_5fcafa44ae10e.pdfIn PDF document text
    • https://jarofipe.weebly.com/uploads/1/3/1/4/131408229/b136f9683d.pdfIn PDF document text
    • http://sawawobutexukut.iblogger.org/zalis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://welavozolin.rf.gd/dolor_abdominal_agudo_en_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/58676838798.pdfIn PDF document text
    • http://tapewiwesumufug.epizy.com/648292944.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/mefenufun.pdfIn PDF document text
    • http://nexopuvesoreben.epizy.com/perform_starter_current_draw_test.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/selunulowoteko.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/tavevemekulix.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/ios_13_beta_iphone_x.pdfIn PDF document text
    • http://malinaliwul.epizy.com/nujipifukapujikex.pdfIn PDF document text
    • http://xovigukesejibem.rf.gd/malofi.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_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 5412 bytes
SHA-256: 7cbdd8ab49cab463c24ae8bfbc80ef9b2b9845bb09cfd3c4a2bcbf0898603e54
font_01_sfnt_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 10456 bytes
SHA-256: c2550959579195ac47df533bc194f1becb9e01d787650cc6f64ab1b064ad95a0

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