Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d4b4bcd9786198…

MALICIOUS

PDF

80.4 KB Created: 2021-04-11 05:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aa411927b20e0c278658a54c9e6a0e25 SHA-1: b51d694727b35369bcc0f70628595a30fc3c0e1f SHA-256: 87d4b4bcd978619843a8b41d1984aed1991c528d75c84011460175e7347f5dfb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns suggest a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=roomba+595+pet+series+battery PDF link annotation
    • http://xuwuvewisin.mypressonline.com/53412516579.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/norma_astm_a370_espaol.pdfIn PDF document text
    • http://gixuloponij.mygamesonline.org/xokuwovizikutojejuven.pdfIn PDF document text
    • http://whitetwo.space/rerududojamidiwituromazuyf1yd.pdfIn PDF document text
    • http://flylovel.com/26302946305raq5m.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/1ji1ib5/cinelux_theater_campbell_ca.pdfIn PDF document text
    • http://yozi.store/takugenokedatulgpnz.pdfIn PDF document text
    • http://itfamily.pro/93103272669460ao.pdfIn PDF document text
    • http://yogistika.space/gulubusuz3vsee.pdfIn PDF document text
    • http://noksipals.online/787878330488n3ta.pdfIn PDF document text
    • http://winsbig.space/best_bodyweight_exercise_app_android35fut.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/lognormal_distribution_joint.pdfIn PDF document text
    • http://lamanixumerad.mypressonline.com/canales_de_comunicacion.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/jhdhjic/zudorimebul.pdfIn PDF document text
    • http://erkutungotu.com/que_significa_estado_de_emergencia_peru_2020rdch3.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/zewexitapofunusanifopuf.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/VUghbxG/download_game_subway_surfers_world_tour_paris.pdfIn PDF document text
    • http://dkshlyap.ru/615961516311jesf.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/zidosozawok/rivavoweritelewelilimomag.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/gidez.pdfIn PDF document text
    • http://nanaxidimidi.atwebpages.com/nediru.pdfIn PDF document text
    • http://dogiwexor.myartsonline.com/zujesesasexoxogobixap.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/iron_man_face_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/17631102464.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/tejotasin.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_off0000f9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 5460 bytes
SHA-256: 17224757b356b1e93fa34e8b9aa615544f085c3c16836e36aa494ace041e57c6
font_01_sfnt_off00010c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6B 11492 bytes
SHA-256: b6ed4eb3b5299e06f520525797be7fd1fa91623567b07793de18ced35d820e89

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