Malicious PDF — malware analysis report

Static analysis result for SHA-256 19aa5de652ee9aef…

MALICIOUS

PDF

75.1 KB Created: 2021-04-22 02:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a9cce7b6081d154e8774c481f3e02893 SHA-1: 9d2f2ca2558452f71e016cfb88e4473809db7b23 SHA-256: 19aa5de652ee9aefd52d572792958e5ef4f5f76f0f1e35bab6844bee655509ac
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://midufefew.ru/strik?utm_term=advanced+excel+skills+for+data+analysis PDF link annotation
    • https://vipofobusaxipol.weebly.com/uploads/1/3/4/2/134234766/00fe52493b.pdfIn PDF document text
    • https://tedogiji.weebly.com/uploads/1/3/0/7/130775371/7712588.pdfIn PDF document text
    • https://mobejameraxoluv.weebly.com/uploads/1/3/5/3/135316129/fubovubikit.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/zowidemo-memobudizateven.pdfIn PDF document text
    • http://rrrrkkkkk.space/7051351650u4twn.pdfIn PDF document text
    • https://kodiridit.weebly.com/uploads/1/3/5/3/135342100/sewujomuxavarin.pdfIn PDF document text
    • http://aicberg.net/gamers_light_novel_spoilersiv09y.pdfIn PDF document text
    • https://xagajopudulu.weebly.com/uploads/1/3/4/6/134697977/290045.pdfIn PDF document text
    • https://kedasolusezobu.weebly.com/uploads/1/3/5/3/135394891/jumagetidinapevafaji.pdfIn PDF document text
    • https://vadiwolor.weebly.com/uploads/1/3/4/7/134737839/ribakibuwamona.pdfIn PDF document text
    • https://rixafewokeget.weebly.com/uploads/1/3/0/7/130739987/nigukagimu-wezas-zifogapexop-ledofi.pdfIn PDF document text
    • https://wusukinepazewa.weebly.com/uploads/1/3/4/3/134372908/149f7.pdfIn PDF document text
    • https://kukutapiroboj.weebly.com/uploads/1/3/4/7/134712573/xugaweza_maruf_paled_sibenevugi.pdfIn PDF document text
    • https://tumulole.weebly.com/uploads/1/3/6/0/136054957/055562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tigefozak.epizy.com/rerefoxonipupujeb.pdfIn PDF document text
    • http://sosuxuzobives.epizy.com/what_order_does_the_shadow_falls_series_go_in.pdfIn PDF document text
    • http://tasowotata.epizy.com/26394206053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/044575a5-df50-453b-a12d-23714cb8dda1/the_heirs_korean_drama_songs_download.pdfIn PDF document text
    • http://tukebakis.epizy.com/does_navy_bmr_help.pdfIn PDF document text
    • http://merowijesajov.epizy.com/77246502685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95508de-9232-43e4-8319-8c1fd5278256/modema.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_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 5296 bytes
SHA-256: eb835ce1a0fbf06953d3153e248d1ec7c071d57e609d715488c68e32aa609f50
font_01_sfnt_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 10244 bytes
SHA-256: b742d0d27fc7a723cfc638e7fd463592cb492f7c0e4af315c6e338327a8bbead

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