Malicious PDF — malware analysis report

Static analysis result for SHA-256 5473397de172ef70…

MALICIOUS

PDF

73.0 KB Created: 2021-03-14 21:35:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9b3e73bd9255c9330f0838c13ffbcc22 SHA-1: b130d6642063a6491a1b8371dea9e88cf3156130 SHA-256: 5473397de172ef70d5d1623226aa853379589cb1317f8fa5357bfc6787dfd7be
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 0.9991

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://crophysi.ru/strik?utm_term=samsung+tv+remote+program+codes PDF link annotation
    • http://yewes.space/nevokihn087.pdfIn PDF document text
    • https://cdn.sqhk.co/subetudagoli/ghgjRLh/class_10_maths_ncert_solution_chapter_4._4.pdfIn PDF document text
    • http://noksipals.online/ethiopia_airlines_crash_reportretty.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/hUtjghg/45060281628.pdfIn PDF document text
    • http://flylovel.com/internal_medicinebzua3.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/3549208.pdfIn PDF document text
    • https://ramosekizopozov.weebly.com/uploads/1/3/0/7/130740175/dediwino-kobugige.pdfIn PDF document text
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/zumadup.pdfIn PDF document text
    • https://kafolegilu.weebly.com/uploads/1/3/2/3/132303068/podibube.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/wigipifelaguj.pdfIn PDF document text
    • http://bigpleasure.ru/76394967649rgdj2.pdfIn PDF document text
    • http://nenugatigubom.66ghz.com/xigojafa.pdfIn PDF document text
    • https://sutovuwoti.weebly.com/uploads/1/3/0/9/130968995/8ff80c.pdfIn PDF document text
    • https://kozegefiseram.weebly.com/uploads/1/3/1/3/131379202/6562125.pdfIn PDF document text
    • http://electriccannoz.club/1342423865285ur0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_7eeaf3e58f184657bfd320af6eb9246e.pdf?index=trueIn PDF document text
    • http://kobewanen.rf.gd/android_auto_not_working_on_sync_3.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_c7d59c4a29bc4806872659be6fb43900.pdf?index=trueIn PDF document text
    • http://nasutewu.epizy.com/bunopibokabetubu.pdfIn PDF document text
    • http://fanavefekur.rf.gd/39420243541.pdfIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_077cdb4191ec4247816be8fb0488f85c.pdf?index=trueIn PDF document text
    • http://xuxirifuv.rf.gd/birthday_song_in_tamil_movie_free.pdfIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_c0e04ea344b045a9b6bc0c753eb1f11f.pdf?index=trueIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_deb605db8a754a2189879eba9bb03cf6.pdf?index=trueIn 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_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 5524 bytes
SHA-256: cff072133d54abe4a75ad5b67cdb9908eef0a6a045b9e1d140b132c2387700fa
font_01_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 10304 bytes
SHA-256: 1e10018a4d3b5d18a90f5188fb5bbab724800602c9ab691bfd34543cd66b0555