Malicious PDF — malware analysis report

Static analysis result for SHA-256 def66fe02cda4f6c…

MALICIOUS

PDF

75.2 KB Created: 2021-04-12 04:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 34254c16f9feaee50e209eaec866b90e SHA-1: 94cdff923898d053337c9ba24d03ac60f80d7641 SHA-256: def66fe02cda4f6c791c9a3fc622ae15df3e6eef14099811dba3bdf60b441547
134 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 and presents a deceptive download button. 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 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://fokemale.ru/strik?utm_term=new+moon+2021+uk PDF link annotation
    • http://mosquito.codes/adobe_premiere_pro_cc_2020_for_freewoleh.pdfIn PDF document text
    • http://bionatur.space/35529308723tvhgd.pdfIn PDF document text
    • http://lavkavkusa.store/91779046218nvjk8.pdfIn PDF document text
    • http://getcreditreport.info/junukenegafutow5bmkn.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/jd2zjf7/caribbean_cruise_deals_november_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rufomezin/hijghi7/pull_him_out_game_level_94.pdfIn PDF document text
    • http://carbags.site/10607424766mbff4.pdfIn PDF document text
    • http://fastcreditreport.info/93324306762wv2yf.pdfIn PDF document text
    • http://handler-autoscout24.com/bleacher_report_live_chelsea_vs_valenciazb86k.pdfIn PDF document text
    • http://matrixbicycles.com/workouts_by_katya_week_4rg094.pdfIn PDF document text
    • http://jusapp.club/tozuronidowonulizuvixukur36pqt.pdfIn PDF document text
    • http://circulshtangcalip.website/monudae4xft.pdfIn PDF document text
    • http://bofinaposo.iblogger.org/kosigaluvu.pdfIn PDF document text
    • https://cdn.sqhk.co/telapunojawu/cjarFO1/9440903636.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/salade/electron_energy_levels_worksheet_answer_key.pdfIn PDF document text
    • http://jizuwugi.rf.gd/99867316228.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/34905074195.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/63987602655.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/xulaninofomab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 4520 bytes
SHA-256: 753a2ed9367a818759d05d551354159b453083259a5f8d87534b61f991f87921
font_01_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 10960 bytes
SHA-256: d79bf8845311aefc21333b8533b1ba8698f7e5336bed3c907ff4f631003c857a
font_02_sfnt_off000111f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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