Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d4172a2fa6d564…

MALICIOUS

PDF

69.1 KB Created: 2021-02-13 05:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f057486934098e936ce04c3a1bed4a7f SHA-1: f7d2be0160c083857d65ad9e3a910ec42dee6fca SHA-256: 57d4172a2fa6d564c2cd349ef0eaa1e506910a281626c95679b92612a1675e0f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The heuristic PDF_SEO_LINK_FARM specifically indicates a large number of external links, with one pointing to a Weebly domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=6th+grade+science+sol+review+packet PDF link annotation
    • https://mujekakuvegaxum.weebly.com/uploads/1/3/2/3/132303245/89a0f731ab.pdfIn PDF document text
    • http://gravkamen.ru/rowojisukimipqdau2.pdfIn PDF document text
    • https://xozilawowoxov.weebly.com/uploads/1/3/4/7/134704750/rutojitifexa-wewaposon.pdfIn PDF document text
    • https://jewutejaj.weebly.com/uploads/1/3/1/0/131070173/302023.pdfIn PDF document text
    • https://retetozatinum.weebly.com/uploads/1/3/0/7/130775023/rudadokav.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/lekuzimulawol.pdfIn PDF document text
    • https://tetusujofejami.weebly.com/uploads/1/3/2/6/132695476/0dc5aa8.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/suxugipipolazog/78570202426.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/xabuxosovuxop.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/quotes_about_success_and_hard_work.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/25764075114.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/88368565289.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/information_about_computer_science_course.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/essex_reporter_classifieds.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/2322079553.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/61816203898.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_off0000d117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD117 5612 bytes
SHA-256: 6a87d44d9a2858951d05863b30bdd1914ec36a0003d91c1c52364c6b104474f5
font_01_sfnt_off0000e43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 10568 bytes
SHA-256: d6bec2e1fd2c19bd922c0a23e5e4bc43150b08c9657fc2442cf3e983239abf0b

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