Malicious PDF — malware analysis report

Static analysis result for SHA-256 b655f08000ace1bc…

MALICIOUS

PDF

77.4 KB Created: 2021-03-28 08:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ada532cfb8ae213987e2bdca211dc4fa SHA-1: 21c89007c34e3ba4394e24e902c9b9efe0759756 SHA-256: b655f08000ace1bc4ba04d3dcf2178b61480c2829c9e8f7a2c6339fa64e6873d
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the idea of a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites.

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://zajinet.ru/123?utm_term=the+impossible+quiz+level+11+answer PDF link annotation
    • http://befelofote.iblogger.org/36847798674.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/jiAjiib/rugimufosakomuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/rebawigabog/iccbZhi/sap_outstanding_invoice_report.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/QbgcRkD/61133306629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422640/normal_5fd23aac410ab.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/bixowizu-nixowolek.pdfIn PDF document text
    • https://cdn.sqhk.co/vujalenan/gchfVPR/36559594919.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/kjajfhi/change_notification_sound_android_9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_601afea155ebb.pdfIn PDF document text
    • http://xovuwut.iblogger.org/bangladesh_passport_renewal_application_form_uk.pdfIn PDF document text
    • https://bavopasivivewid.weebly.com/uploads/1/3/0/7/130738836/tivadol-samotedo-ziwizig-sixoxulawebuz.pdfIn PDF document text
    • https://cdn.sqhk.co/medugagoviji/ftMhb8y/best_daily_planner_app_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/xisofofumew/gjvhamb/rspca_animal_cruelty_report.pdfIn PDF document text
    • https://cdn.sqhk.co/vukobefebu/Cbmmgi9/blocky_story_war_path.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458826/normal_5fe33e0ac7e25.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/kic4hh7/little_commander_2_mod_apk_unlimited_money.pdfIn PDF document text
    • https://naguxamo.weebly.com/uploads/1/3/4/6/134655503/fisepokabekeri_jokigitilebuki_polupafimu_safifokitudivaz.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/ijfYGhh/sushant_singh_rajput_songs_mashup_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/hgyidgj/28495915572.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 5528 bytes
SHA-256: 0779044ce0ece2493c9a994aef183013f13477e422b0f995c71a13e84fc4e66a
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 11124 bytes
SHA-256: f7f2e934f00dda097f4535933cfe37aff5aab1da18815480eb512c2c013790da

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