Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c91ca2c802997b…

MALICIOUS

PDF

83.2 KB Created: 2021-04-01 18:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1fd3eefb9cfa1884d3936569cc3c326f SHA-1: cc5e6c9bc2c1d821b6c26e15b2e986369801f2d1 SHA-256: 18c91ca2c802997b33274925f5a0d1d4cc22090ed3df6ac3a9f0b7c4723262a0
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious sites. The primary URL, 'https://mezovuduw.ru/wix?keyword=instagram+hack+apk+simulator', indicates a lure related to hacking tools. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=instagram+hack+apk+simulator PDF link annotation
    • https://cdn.sqhk.co/tamejenonisi/shOhhzS/wuwipejulavezo.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/jbpIggv/hammer_simulator_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/oQijTSV/warzone_turn_based_strategy_pc.pdfIn PDF document text
    • https://wexigovepabenu.weebly.com/uploads/1/3/0/7/130738565/910e282bbbbfd.pdfIn PDF document text
    • https://jogabaxeke.weebly.com/uploads/1/3/4/7/134704809/wanenewowozibob-sumumidivasinu-xadol-domegipimudur.pdfIn PDF document text
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/b755b2b0.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/f02hgJH/jizototosikise.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/durizaliraf.pdfIn PDF document text
    • https://sasofisapen.weebly.com/uploads/1/3/4/5/134590640/wanasu-mibavose-lixut-viwipa.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/CaIKhiw/mazie_hirono_age.pdfIn PDF document text
    • https://dutaveporope.weebly.com/uploads/1/3/4/6/134600224/a4966f8ba19a64.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/letibitademikupe.pdfIn PDF document text
    • https://cdn.sqhk.co/vefasebo/ieCxggx/time_traveler_s_wife_streaming_vostfr.pdfIn PDF document text
    • https://cdn.sqhk.co/xodawakadude/JUhiVhh/xekodarebexulegezena.pdfIn PDF document text
    • https://buruwezixefekiw.weebly.com/uploads/1/3/0/7/130738548/6079110.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/wajufifenoxuj/coding_standard_document_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/nursing_intervention_of_anorectal_malformation.pdfIn PDF document text
    • http://lajovaputap.myartsonline.com/deficiencia_de_vitamina_b.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/business_infographic_template_powerpoint_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/14610615996.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 5348 bytes
SHA-256: c1a31a3de62c8abde71bb1d03a95b5cf5f0e56b5ce62ccbb3568695e2cf37d09
font_01_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 11732 bytes
SHA-256: b0dd9a6e47cc4d11d1b3e67e4c75dfebe604bd96adefb5a91bceda09543938a0
font_02_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 16132 bytes
SHA-256: 6c511cd2548aab1566dad8f54fccf2be4cd056cf5a4d5d56937977fde9165995