Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd98af4449808ba…

MALICIOUS

PDF

80.3 KB Created: 2021-02-25 12:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d4c089add55615f08c99c0e1e22439cf SHA-1: 2d7550a5fcb095371f1dd213e880df64b58f9f8a SHA-256: dfd98af4449808ba97f5079f58e3ff4d56998fe9a89a2825f714ecab470c2f0e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with at least two pointing to potentially malicious domains ('bologen.ru' and 'folivapizi.66ghz.com'). The document body, though partially corrupted, contains a question about sailing knots, which is likely a lure to disguise the malicious intent of directing users to these external sites. No scripts were extracted, but the presence of multiple external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/123?utm_term=why+do+sailors+use+knots+instead+of+mph PDF link annotation
    • http://folivapizi.66ghz.com/poetry_comprehension_worksheets_for_grade_4.pdfIn PDF document text
    • http://aycotoro2.xyz/traffic_tour_hack_mod_apk_revdlx4ns7.pdfIn PDF document text
    • http://apparentlyopt.com/xbox_360_controller_wireless_adapter_for_windows_10anp4g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410962/normal_5fee17df97b0e.pdfIn PDF document text
    • http://alluniversity.fun/the_third_day_episode_3_analysisrm51v.pdfIn PDF document text
    • http://setovewurepenu.22web.org/nadito.pdfIn PDF document text
    • http://thechambre.xyz/aluminum_sheet_metal_surface_finish_chartl9osr.pdfIn PDF document text
    • http://tells.fun/color_run_houston_march_2019kv2qh.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/wopisdth8c.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/nutanigonu/41442016431.pdfIn PDF document text
    • http://matezule.rf.gd/18634494074.pdfIn PDF document text
    • http://topawod.epizy.com/zomifom.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/alesis_hr-_16_service_manual.pdfIn PDF document text
    • http://vekubuj.rf.gd/duriduvewumelewoxu.pdfIn PDF document text
    • http://laxunuwozen.epizy.com/general_science_reviewer_with_answers.pdfIn PDF document text
    • http://xunepesefosog.rf.gd/melhor_rpg_android_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/tcs_aptitude_questions.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_off0000eccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 5344 bytes
SHA-256: 78c988ce8a662a5bb993d92b00941c2ca111e2462483ef8d16ca031b80cc9041
font_01_sfnt_off0000fedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 11328 bytes
SHA-256: 9f3c10e92897af599a1fdad4b7da13499d1d5c16b6c1ff5dccb01261ddc6ffa3
font_02_sfnt_off000125a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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