Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a11766404367a47…

MALICIOUS

PDF

79.4 KB Created: 2021-03-09 18:04:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9289e4a1cf65d1dc07881c37b3aa9fea SHA-1: 98ee3c12d14ffb4ce2eb5116f95eb9219ecd0af7 SHA-256: 0a11766404367a472d699f25060240506b40194519788bc08368d4c418c47683
186 Risk Score

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 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://baarspo.ru/123?utm_term=content-+type+application%252F+json+multipart%252F+form-+data PDF link annotation
    • http://terem.space/worship_music_chordszeto3.pdfIn PDF document text
    • https://gubagomokugexat.weebly.com/uploads/1/3/3/9/133988684/606227.pdfIn PDF document text
    • https://voxonororipesap.weebly.com/uploads/1/3/5/3/135383222/bidux_mavozovopirimub.pdfIn PDF document text
    • https://vimumigejanamim.weebly.com/uploads/1/3/4/6/134619591/6565056.pdfIn PDF document text
    • http://autoport76.online/which_of_the_following_is_not_considered_a_plant_assetct5qi.pdfIn PDF document text
    • https://kavisovilige.weebly.com/uploads/1/3/5/3/135308643/0227a5e.pdfIn PDF document text
    • http://tcerkovniekupola.space/wosexw8dfr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/831cb617-6753-4358-b070-474ce669bc5d/imovie_tutorial_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/3140564967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0929df8-aa1e-4bad-a4b1-9f63644f6259/bewonuxevijin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c769a1-33fb-45c3-9e93-e4bc83784f0f/how_do_i_turn_my_webcam_on_windows_10.pdfIn PDF document text
    • http://xuwuwum.epizy.com/64740997349.pdfIn PDF document text
    • http://rajiwewovipu.epizy.com/loy_krathong_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/zowogaveluravonizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50925fc-f93a-4fa7-80a6-e3359a9aad84/80556859894.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/90105311068.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/12347258697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a28415-c998-4a56-8302-7b9dfe5c00ed/complex_analysis_stein_solutions_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 2996 bytes
SHA-256: a81079ab852e8fa43012d57f6bdaf40c3babaa8285a258e85a8bd9d07197054b
font_01_sfnt_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 5452 bytes
SHA-256: d52a48ddf3cb178435a89e30d4f9f4a9dc6db01eafa9594614f935a5628ca2ad
font_02_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 11388 bytes
SHA-256: 6ec21f54225dcf23bd7c1747acee4ed58a3c07bdd466e46e0d3460a587d2248c