Malicious PDF — malware analysis report

Static analysis result for SHA-256 88814ee0e713b3d1…

MALICIOUS

PDF

96.8 KB Created: 2021-03-29 09:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d35c35866dbc9916d1b64f35775627d1 SHA-1: a94d35e675af9917d564d142dfcb41280ac250da SHA-256: 88814ee0e713b3d15c32db2c2cd5ccb105652dd7c5c0be9299d077452f335b5d
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://zajinet.ru/123?utm_term=iphone+6+user+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/gijimexuv/V3ia0gh/57922521303.pdfIn PDF document text
    • https://cdn.sqhk.co/zukuxenopo/dyhGtGy/13334060813.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/WTkXjRF/79647293745.pdfIn PDF document text
    • https://cdn.sqhk.co/xadelakora/hfQulKv/vofuxuzi.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/hbhgEji/bewars_audio_songs_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/xSghoQ3/waxul.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/005f942.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • https://cdn.sqhk.co/xagogudexo/UfjbYja/lofaxaxirukupis.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/hiG5dgi/roads_of_rome_new_generation_2_bonus_level.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuzofi/hi5VjbZ/capcom_home_arcade_console.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/hN8jeje/neighborhood_walmart_moss_bluff_pharmacy.pdfIn PDF document text
    • https://muluxebaxomoj.weebly.com/uploads/1/3/5/4/135401331/lewisigaxefokizaro.pdfIn PDF document text
    • https://cdn.sqhk.co/zodenizekija/9jajf3C/chickamauga_battlefield_gun_museum.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/0QibBgc/lobujopodogojeserasuv.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/e45iige/tazuzumebudejumaki.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/jbcYhd0/zijifetituvuz.pdfIn PDF document text
    • https://pudukodup.weebly.com/uploads/1/3/1/4/131407572/mobolixokixa-nebikejini-pilepajobagaw.pdfIn PDF document text
    • https://cdn.sqhk.co/rukeditele/GeBhiGN/fokus.pdfIn PDF document text
    • https://ditixalopu.weebly.com/uploads/1/3/1/4/131410538/2767837.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/ba4fe.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/ziwuvijevo/87062992827.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/16138027209.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/simile_metaphor_personification_hyperbole_irony_worksheet.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 5152 bytes
SHA-256: 1d2932e7ecbabf72c1841418dd35d39b4d079d98c37478fb177eeb8954f40b54
font_01_sfnt_off00012127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12127 2096 bytes
SHA-256: 27b27cb026a70f682d91d452e965ee62c68176e502a6e078b01353d0d7d5e397
font_02_sfnt_off00012ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE8 13368 bytes
SHA-256: 812831bb8699d3946687a11235e58eb284037bbda4efdb79ae72d24faa5523ce
font_03_sfnt_off0001569d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569D 19320 bytes
SHA-256: 3e1c884bf0c350a79cf82a280acb11ba60399d0d1f0b626da74a9d1b65c4f34c