Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8be60d4d57eb95a…

MALICIOUS

PDF

78.5 KB Created: 2021-02-27 18:31:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 228f7beaf801233b7024549dde1f0db1 SHA-1: 9bf7e301db91bf4e2da1186e75bd280ca3dcb6b4 SHA-256: e8be60d4d57eb95a78ccb2e2a202ad419763ec35cd5e325dee5c0c96620604c8
186 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. 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://gimoguvi.ru/123?utm_term=tracfone+zte+user+manual PDF link annotation
    • http://kebosukav.22web.org/english_dictionary_database_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404297/normal_5fdfc46b45458.pdfIn PDF document text
    • https://xisofapetuv.weebly.com/uploads/1/3/4/7/134747578/gejozog.pdfIn PDF document text
    • http://sozefavi.22web.org/90943311508.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/Enicyzm/jujexawobizosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5fe834e024654.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/jchiha9/gym_training_exercises_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikebepo/TQFwZhj/94732950762.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuwatipo/9xhhAKj/28565058730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_602484af409c0.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/ZGjhrhX/bipikipebi.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/jh1PssE/learn_speak_english_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/Hiea8je/79524522557.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/Dp4hcuO/crowd_hit_3d_printer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jowatazurusu.epizy.com/wawevizonupub.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/romeo_and_juliet_role_play_script_summary.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_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 5028 bytes
SHA-256: d2ef712a8ebc922f99bab819fad7abaedfa38a5bb9d3b7e3dc1d663a359cffa8
font_01_sfnt_off00010736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 11044 bytes
SHA-256: 251878b4a0bfc46d2681d0a34559a092ddc989aaae4655f586ead2cdacf7ef99

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