Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbb1b7feb846d1b…

MALICIOUS

PDF

102.1 KB Created: 2021-03-02 09:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 86515bc18d1a101bdcef8d7e300a5187 SHA-1: d7c9a04340d497126ef296123ce1fd0e1cc6ba7e SHA-256: 7cbb1b7feb846d1b6ead74b5527d4cc39b80d98fa1c65bcc75e9ac81ce7e427e
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, containing numerous external URIs and link farm characteristics. The document body, though heavily obfuscated, suggests a lure related to online meetings. The presence of embedded URLs indicates an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=aa+and+na+meetings+online PDF link annotation
    • https://cdn.sqhk.co/tinulafi/ia4gijb/xatoraxowub.pdfIn PDF document text
    • http://present-mag.ru/pemomajamifozunojle8wa.pdfIn PDF document text
    • http://vilopeg.xyz/descargar_nfpa_70e_2018_gratis_espaoldescargar_nfpa_70e_2018_gratis_espaol8pi4v.pdfIn PDF document text
    • https://cdn.sqhk.co/vawikepaf/SZN7ji6/97862123531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472185/normal_6010a1532bb97.pdfIn PDF document text
    • http://gixuzozubo.22web.org/how_to_use_samsung_remote_app.pdfIn PDF document text
    • https://cdn.sqhk.co/lokuwanij/ge2ohfi/sokibakikimefer.pdfIn PDF document text
    • https://cdn.sqhk.co/telapunojawu/hIgk3ih/guided_reading_strategies_by_level.pdfIn PDF document text
    • https://cdn.sqhk.co/pobusafi/ghchcje/twisted_wonderland_lilia_cards.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390680/normal_6011dcf0265e9.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/lBhcZ9Z/adventure_turtle_hero_parkour_ninja_racer.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/DhjvMia/bronze_age_mindset_review_claremont.pdfIn PDF document text
    • http://getarileduvuda.22web.org/attack_on_titan_season_2_opening_lyrics_english.pdfIn PDF document text
    • http://indital.space/57116376035ms7zp.pdfIn PDF document text
    • https://cdn.sqhk.co/mupalewefe/gcjerhj/baby_girl_christening_outfits_modern.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dukizovisepo.rf.gd/tokyo_ghoul_wallpaper.pdfIn PDF document text
    • http://xefavab.rf.gd/english_vinglish_movie_moviescounter.pdfIn PDF document text
    • http://nekezoxugi.rf.gd/guvupupibekusujut.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B51 5040 bytes
SHA-256: 9467b2236163874cff4bd69a7b995267654fac00ba5f0a511a54894eb84c141d
font_01_sfnt_off00014c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C66 11776 bytes
SHA-256: 2dcce249ca939b0b5674a7eafc6284c2b91ea1a26cc8d4f2059abc7115a3f050
font_02_sfnt_off000173ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173EC 16712 bytes
SHA-256: a88f3635265ff5cb7f2c664c5620a334f3930b3fe8fc5224ed71dab5f12efb10

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