Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d816ae18ff0db3…

MALICIOUS

PDF

76.7 KB Created: 2021-05-11 12:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3bfaae3275d3a870f1fd117a19e7f8bb SHA-1: e25fe20300df94984b98f1092a957bf51fcf1443 SHA-256: 29d816ae18ff0db3c791d7dad5cd51b7da0757e83866d083d8549d833f58240b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifier with high confidence. It contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The primary malicious URL identified is https://nipisod.ru/strik?utm_term=bosquejo+fuerzalos+a+entrar, which is likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=bosquejo+fuerzalos+a+entrar PDF link annotation
    • https://rafutadavo.weebly.com/uploads/1/3/1/6/131637052/77b833.pdfIn PDF document text
    • https://famixarusefon.weebly.com/uploads/1/3/4/3/134396739/sajimebebobide_gonejofazus.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/etifYuH/75663613124.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/lgfsxXo/sesitodojomalolos.pdfIn PDF document text
    • http://tricitysikhs.com/what_does_proofreading_marks_mean2lc3z.pdfIn PDF document text
    • http://carbags.site/neximasuburuxifixn6ru.pdfIn PDF document text
    • http://tortomsk.ru/97248400647mxbmv.pdfIn PDF document text
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/duwapukukige.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/bs8hjhb/risoli.pdfIn PDF document text
    • http://ru-1.casa/fender_mustang_amp_v2_70_wattknbu1.pdfIn PDF document text
    • https://jefolujolu.weebly.com/uploads/1/3/6/0/136096950/fapemuxinolamejujob.pdfIn PDF document text
    • https://cdn.sqhk.co/xusorawoka/ibjjCib/pilosumivezejukavovulax.pdfIn PDF document text
    • http://eurostore.info/maligemabavatund5byi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_745451fc04454994a93987a36c13beeb.pdf?index=trueIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_c620ae8a3c06455b8f788ca8c22bd6e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegek/caractres_spciaux_clavier_android.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_dd30bd32204b475ea3b010026aedac34.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_7eb4be6dd8ed426ea8a691ea7daddc3a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jakujakula/charles_capps_gods_creative_power_for_healing.pdfIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_6d5cdb3f20f846419d9892d0ded964d9.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_8d64e969616348daa5964de13c281689.pdf?index=trueIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_0eb761e948764df7b6c696c2570bfda7.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_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 5064 bytes
SHA-256: 5e1c1bbdff69b28ed083f480235e54fc2b4365b4d371e3b257ecf908a01db2a6
font_01_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 12264 bytes
SHA-256: f9c4674222345e11a5f930cf431018484ebf959cc2b225fe468319207226b14e