Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa51da9e0e7d9f4…

MALICIOUS

PDF

92.4 KB Created: 2021-02-14 15:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 906d7e057bb4f3b88536653390049388 SHA-1: 18018c9aed25101e0f30ca0931c0a6ff4bdced4f SHA-256: 1aa51da9e0e7d9f43e3b5de858bbfa0d5e55906d60def20ff3c02767cbd0cada
186 Risk Score

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 0.9998

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://maypoin.ru/aws?utm_term=proclear+daily+multifocal+fitting+guide PDF link annotation
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/9a1945643c.pdfIn PDF document text
    • https://zatofurepodato.weebly.com/uploads/1/3/1/4/131482853/tuxukaxej_mesazi_rusalag_luwoza.pdfIn PDF document text
    • http://kidunotofonaxiz.22web.org/5103590074.pdfIn PDF document text
    • https://rolobidixogiru.weebly.com/uploads/1/3/1/6/131637372/bba07e.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/zalosogade-wenusaxog-siliz-pujomesurupolu.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/SXvqgie/53576123442.pdfIn PDF document text
    • http://meblik.su/30369151922i5k58.pdfIn PDF document text
    • https://cdn.sqhk.co/rezalabobo/heVhfgi/prospect_united_methodist_church_east_bend_nc.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/hjiija9/19482078269.pdfIn PDF document text
    • https://cdn.sqhk.co/voguzasijur/0ifijri/arabic_ringtones_for_android_mobile.pdfIn PDF document text
    • https://lizitizesibegip.weebly.com/uploads/1/3/4/6/134685526/gumokixovulewe.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/4577960.pdfIn PDF document text
    • http://unosital.space/le_cercle_de_la_forme_republiqueuksjv.pdfIn PDF document text
    • http://alexandreablog.com/game_my_talking_angela_cheat_apko4eja.pdfIn PDF document text
    • https://gumikixinugud.weebly.com/uploads/1/3/4/8/134864359/ac92f471d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sotemapepuko.epizy.com/susigaranova.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/charkha_punjabi_song.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/vajovivotikididezev.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/conditional_formatting_borders_google_sheets.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_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 5264 bytes
SHA-256: 5998831bf5d5deb45f0d5f013fe335549afc225045e4818047797585ecbfe4b7
font_01_sfnt_off00013e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E34 11148 bytes
SHA-256: e3893376b02cfe43fd4a465945dded904eb8e34ea520d249016530754ad7ac61

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