Malicious PDF — malware analysis report

Static analysis result for SHA-256 315f84f7995cd0f8…

MALICIOUS

PDF

77.8 KB Created: 2021-02-18 05:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 904da0850c1d6cad9f02fe73b5d348ca SHA-1: e1e0539cf18ae849a4ca2a5a24b2eda85713f003 SHA-256: 315f84f7995cd0f850a49c7a79c08e2ec20a5c67d1144e851a0b36a4d90d04d4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=hb+800+bluetooth+user+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405902/normal_601208e125fad.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/jefaki.pdfIn PDF document text
    • https://bopevifobomamak.weebly.com/uploads/1/3/0/8/130814579/528ce6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_6026cb7532c70.pdfIn PDF document text
    • https://gotedajasokidu.weebly.com/uploads/1/3/1/4/131407980/gebejipufalagid.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/iF6no8N/super_sergeant_shooter_2.pdfIn PDF document text
    • https://xikofekukinakij.weebly.com/uploads/1/3/2/6/132681309/pawaworefavobefanew.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/33haXia/87722669020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_5fdaad0ba30a8.pdfIn PDF document text
    • https://cdn.sqhk.co/desiruzag/jhimje3/guess_the_song_2020_kahoot.pdfIn PDF document text
    • https://cdn.sqhk.co/libabafo/m2bPij3/craft_guide_1._12._2_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_600b0b2cc5f85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejetetivapane.epizy.com/autograph_bengali_film_song.pdfIn PDF document text
    • http://relumewamamit.rf.gd/49268264328.pdfIn PDF document text
    • http://zapesuxeliribi.rf.gd/31316864804.pdfIn PDF document text
    • http://fevoreselo.epizy.com/banjara_dj_songs_2018_audio.pdfIn PDF document text
    • http://vanomuwoz.epizy.com/alchemist_book_summary.pdfIn PDF document text
    • http://liwubujuwu.epizy.com/likatafunepumawiz.pdfIn PDF document text
    • http://nalirabagetovop.epizy.com/customer_service_training_guide.pdfIn PDF document text
    • http://bugixud.epizy.com/french_wine_for_a_flat_belly_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 5360 bytes
SHA-256: fdc5bdddca24aaf558df9688883ca344ae7799ba2e26aacd34e088c7bd6213a9
font_01_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 10968 bytes
SHA-256: 01a972a19dd0af1cd335b524468515014b3cf5bb0e321715170a32e41bb7e8ad

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