Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a522c32932cde5…

MALICIOUS

PDF

80.9 KB Created: 2021-04-17 23:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: af53dcec3880b7f9fbfd06a736588b8d SHA-1: 43489f431d20a8df6ca10eb8ccc6b6eb8158d52a SHA-256: a1a522c32932cde5f09af8d2c1948d3f2eeae164f19eea72bbe3f86d6d85e805
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for phishing or distributing further malware. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The embedded links, such as 'https://resalured.ru/strik?utm_term=cuisinart+pressure+cooker+cpc-600', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=cuisinart+pressure+cooker+cpc-600 PDF link annotation
    • https://cdn.sqhk.co/nobixapo/2fjdjdt/motorcycle_speed_record_hayabusa.pdfIn PDF document text
    • https://metoxuxiduwano.weebly.com/uploads/1/3/1/6/131636764/5b32971.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/jiie3G2/tom_rundgren_songs.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/pafudoketisep-nuxijawodil-dusugadujoxow.pdfIn PDF document text
    • https://cdn.sqhk.co/rowubuvuke/ifghidT/gimupuvowipew.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/nabalutexiraseralu.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/how_do_i_manually_run_hunter_pro_c_sprinkler_system.pdfIn PDF document text
    • https://vomifudumapo.weebly.com/uploads/1/3/5/3/135345338/moxadufez-wavisidin.pdfIn PDF document text
    • https://viwefinorix.weebly.com/uploads/1/3/0/8/130813514/vobeb.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwosowo/ghjcnrk/persian_calendar_2021.pdfIn PDF document text
    • https://janusizexagelu.weebly.com/uploads/1/3/5/3/135337128/eaad82eb7.pdfIn PDF document text
    • https://malufatagu.weebly.com/uploads/1/3/0/8/130874424/pivozikig.pdfIn PDF document text
    • https://buralekareze.weebly.com/uploads/1/3/4/3/134326789/xemilevi.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/iabKQjj/seven_deadly_sins_grand_cross_code_box.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/fwjbGjf/mekeminuridaxog.pdfIn PDF document text
    • https://zunezazawegor.weebly.com/uploads/1/3/4/6/134665047/3137228.pdfIn PDF document text
    • http://peguxukeziku.sportsontheweb.net/57022229868.pdfIn PDF document text
    • https://cdn.sqhk.co/basunemavut/jWuvMOg/kuzapuxifesolos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/casio_fx_cg20_emulator.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/63438849734.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/99108596655.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/zamapanaxuruwoluvowuk.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/7035290234.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/dictionary_cambridge_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/vakusupajuf.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_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 5192 bytes
SHA-256: c1282af692d8fecfdc4d26fbc3921b3903a1cdd3de992ecd5066376b6be85537
font_01_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 11656 bytes
SHA-256: 07c28108dfb0c501d7f0391b401ccd54e0bddb56d6020e10e0b3eca80410c46f