Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd390167c878daef…

MALICIOUS

PDF

103.0 KB Created: 2021-03-21 20:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 923de42e6849964685d4fe9e0c516df3 SHA-1: 97d73f5a6c0ac189f01de529ecf5dd2a406b97d3 SHA-256: cd390167c878daef96d1f369c7032257a20cf8bbd029fb44de3410f4298da2ba
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://dugedepap.ru/wix?keyword=learning+statement+reference+guide PDF link annotation
    • https://febixitojujemo.weebly.com/uploads/1/3/4/4/134402622/lajugejiwamutam-wirudigelobonud-jatojaxo.pdfIn PDF document text
    • https://junalupi.weebly.com/uploads/1/3/4/4/134460459/wirudifulaz.pdfIn PDF document text
    • https://ledimame.weebly.com/uploads/1/3/5/3/135306483/munoze_xevazegaz_litid.pdfIn PDF document text
    • http://figixifokemamu.22web.org/93127470528.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/jazuravazaguz/runescape_auto_typer_and_clicker.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/cisco_firepower_cli_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/fafijawi.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/novadimezezagaboromuve.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/fejifodireg.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/58925202644.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/rugasujogogawimotalilokir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a56c7322-745a-4b3c-acda-1431f6faa80c/dachshund_breed_standard_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce51f220-55fc-4986-b868-86e168ccc7b7/musowozobekevad.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/appreciation_certificate_template_online.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/12726895142.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/cant_find_realtek_hd_audio_manager_windows_7.pdfIn PDF document text
    • http://tarisuwagawata.epizy.com/cassava_cyanide.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/72256697699.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/special_plural_nouns_worksheets_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/hp_photosmart_6510_scan_to_computer.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_off00015402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15402 5252 bytes
SHA-256: 12a518acf0b8eecbb2c53382691ae23a90fc1ea1d6128373d9fb486c797ea4c3
font_01_sfnt_off000165d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165D0 11792 bytes
SHA-256: 6ecb85131f072deedc898addaf14a70572449693be27ab17c8755d63f8948967

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