Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fe3fd38902b005…

MALICIOUS

PDF

81.7 KB Created: 2021-05-14 16:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4381db98e7dd054fa42694b318634067 SHA-1: 247bc454f41583def3b98067e26f3b1ae810a565 SHA-256: 19fe3fd38902b005ff60c8ebd94513439ed19eb74ae66f4dc5a967d08d11e648
134 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=dsl+2730u+firmware+update+india PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445326/normal_6015461bd8152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426085/normal_60603ec0d33ca.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/lBJvMhe/21769804207.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/bartleby_el_escribiente_libro_completo.pdfIn PDF document text
    • https://cdn.sqhk.co/xapawavuma/gejbqol/samsung_account_payment_methods.pdfIn PDF document text
    • http://tinipen.medianewsonline.com/sujabezuw.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/jbih5hb/how_do_you_say_hi_guys_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/hhzgljj/directv_apple_tv_3rd_generation.pdfIn PDF document text
    • http://dakajak.medianewsonline.com/misilolezewamoluvopuva.pdfIn PDF document text
    • http://bifozitixexidad.mygamesonline.org/logawesosokigezoxebusugag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465687/normal_600295f307f36.pdfIn PDF document text
    • http://nelodagavezes.mygamesonline.org/nccn_cervical_cancer_screening_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/jufulezamuko/ggfjggf/sulexuduloluvik.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/mappa_ztl_bologna.pdfIn PDF document text
    • http://birapemotafew.mygamesonline.org/xikapejesobetibevew.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/kezemiradigu/86527878336.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/navien_240a_dip_switches.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/molusufor.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/thomas_merton_books_free_download.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/nixugalajabo.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/97823732614.pdfIn PDF document text
    • http://fuvuxejuv.myartsonline.com/segimaviworos.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_off0000e84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 5796 bytes
SHA-256: b897bff48281244d3378487f372d68b14d49869f91721252983887f6986413d6
font_01_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 11148 bytes
SHA-256: d26668a882d27b7700820987f8fd7fc9c70d1ae7083653a85a95564890971c8d
font_02_sfnt_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501