Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c11262cd3e6b40…

MALICIOUS

PDF

80.0 KB Created: 2021-03-15 14:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 80df4cb426a9f740128fbdf1a28d13e9 SHA-1: 1f9b4c35595b71662e7560323e6b52eec54b9ec4 SHA-256: c8c11262cd3e6b40fa39c5009329a71006a447db3aaf7ec24ea21a66f9d6a817
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to SEO-optimized PDF documents, suggesting a link farm or content stuffing tactic. The presence of a URL pointing to 'mobomarket 3.0.9.5 apk download' indicates a potential lure for users seeking software. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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 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.
  • 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://golowaki.ru/wix?keyword=mobomarket+3.0.9.5+apk+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445892/normal_5fdebdf12afb0.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/cyjaIif/61932456979.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/redonanote.pdfIn PDF document text
    • https://tajuwelaf.weebly.com/uploads/1/3/1/0/131071184/2346341.pdfIn PDF document text
    • https://cdn.sqhk.co/falupuvevore/gTgghho/korugaputavuvavewon.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/aIhahcT/tik_tok_songs_youtube_playlist.pdfIn PDF document text
    • https://cdn.sqhk.co/xedasuzefer/almhejj/waste_management_cdl_jobs_near_me.pdfIn PDF document text
    • https://wakebanimoxebej.weebly.com/uploads/1/3/1/3/131383753/jatorarizijotilikexe.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/cijgfzs/nyan_cat_jumpscare.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/has4ioo/stink_and_the_freaky_frog_freakout_quizlet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381539/normal_5ffdc4583278c.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/hdoohaV/kesis.pdfIn PDF document text
    • https://gifofelonapa.weebly.com/uploads/1/3/0/7/130775883/rewekato_zitel.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/hdWpiic/sing_karaoke_app_free_download_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501514/normal_5fcb708e8f865.pdfIn PDF document text
    • https://cdn.sqhk.co/naxenunovus/gdifggK/scrap_metal_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/lolumebitana/jdDiCGc/shanghai_disney_resort_hotel_price.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/banula/what_are_the_best_classical_guitar_strings.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/61496843479.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_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 5848 bytes
SHA-256: b6c06ed499db151c3d545adf0fcd6a2bdf9695ba815e58372982932e735be975
font_01_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 11128 bytes
SHA-256: d934fdd82a53fa1441568699ff10a501dcc956f56cdb414683697f8ea0e986f1

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