Malicious PDF — malware analysis report

Static analysis result for SHA-256 55be545370c65fea…

MALICIOUS

PDF

73.8 KB Created: 2021-03-17 00:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aa4e7c6d46ddba607c24207882d58166 SHA-1: 2dfcbc36b3614d6febdc4b7f5baacf3035534c6b SHA-256: 55be545370c65feaf514e4960253f59cc7bf868eef56c8bc8c9ad25c6112720f
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 0.9997

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.
  • 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://pelibifir.ru/strik?utm_term=combining+like+terms+and+distributive+property+activity PDF link annotation
    • https://rapugudunoxe.weebly.com/uploads/1/3/4/0/134012743/pisotofog-rozusojisubu.pdfIn PDF document text
    • http://fakosujonipej.iblogger.org/rufegobizufan.pdfIn PDF document text
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/butibuz.pdfIn PDF document text
    • http://pokawibu.iblogger.org/criminal_law_book_1_reyes_free_download.pdfIn PDF document text
    • https://lafezarawowaw.weebly.com/uploads/1/3/0/8/130874252/3379967.pdfIn PDF document text
    • https://bixirugabo.weebly.com/uploads/1/3/0/9/130969405/julupasemej.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/RnCgfuT/free_standing_sculpture_definition_in_art.pdfIn PDF document text
    • https://cdn.sqhk.co/votawusebak/Tjgidge/trackaddict_obd_video.pdfIn PDF document text
    • http://todibojoposufu.iblogger.org/bivijosimazukimugosu.pdfIn PDF document text
    • https://tosopolugo.weebly.com/uploads/1/3/4/4/134440872/cc47f955a0.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/jahahdA/splash_wines_customer_service.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/e9e7cbcb-3c97-433f-803d-71f00d10ca8a/xibalifigemizoduwujikif.pdfIn PDF document text
    • http://sarupuxev.epizy.com/jupina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9a5314-d634-43b9-9fdd-3a69e3f4c421/love_songs_of_the_90s_r_b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df74095-22f9-43e1-b332-542561cfddf9/how_long_does_it_take_to_get_hired_at_chick_fil_a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18496f0c-0bf4-466c-8634-71980525d414/sharepoint_2013_workflows_disappeared.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5a3c6d-b646-424d-8410-df94fe187b65/nelson_textbook_of_pediatrics_17th_edition_free_download.pdfIn PDF document text
    • http://surufutikexa.epizy.com/soxemalurasusogiwurilolal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbec0460-1dc9-44f8-8fbb-688bb5f8ce9b/what_does_it_mean_when_my_whirlpool_duet_washer_says_sud.pdfIn PDF document text
    • http://vopawolug.epizy.com/59262517909.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_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 5664 bytes
SHA-256: 069b737d973e4130f160930fce63289739258252c36ab865b26bba929d6a3818
font_01_sfnt_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 10552 bytes
SHA-256: 737aa373afe8d89f7c53965592b76111d3e21a68b1170ab938b7a548fbb38988

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