Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae10cac9ff03651f…

MALICIOUS

PDF

69.3 KB Created: 2021-01-12 14:10:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d843994605f3993a75ba8a4305771887 SHA-1: 757e5cae29e36d23e2656a045ebdb1356dbd5b73 SHA-256: ae10cac9ff03651f484ad03632b5bf555359acfbaaa3bf7fab3389282d5e7265
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, one of which is associated with a potential phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=visio+mechanical+drawing+template PDF link annotation
    • https://site-1168079.mozfiles.com/files/1168079/gibirofar.pdfIn PDF document text
    • https://lulakoxefinadi.weebly.com/uploads/1/3/4/3/134332070/romakit.pdfIn PDF document text
    • https://site-1175227.mozfiles.com/files/1175227/tasovesegamexivaviwax.pdfIn PDF document text
    • https://site-1201336.mozfiles.com/files/1201336/google_analytics_individual_qualification_exam_answers_quizlet.pdfIn PDF document text
    • https://site-1176979.mozfiles.com/files/1176979/kefuj.pdfIn PDF document text
    • https://site-1227608.mozfiles.com/files/1227608/tenuvuduwiruv.pdfIn PDF document text
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/8197899.pdfIn PDF document text
    • https://xomilazarega.weebly.com/uploads/1/3/4/5/134511507/pivenewid-pixogovow-gakivojixivi-tezetan.pdfIn PDF document text
    • https://site-1174029.mozfiles.com/files/1174029/epic_skaters_united.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/gavexilatuvitaz/kissinger_report_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/chiari_2_malformation_wikipedia.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_off0000c779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC779 5544 bytes
SHA-256: 2d18c57a36b79aa13306eddf680f35faeb590ebcfbd679579ea9b161a3630405
font_01_sfnt_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 14148 bytes
SHA-256: 148b67718a4101b45088cac36b848ad2a44148538433a361020fe65af97d4b30

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