Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c137e0b65c6dab1…

MALICIOUS

PDF

91.5 KB Created: 2021-02-16 03:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e86bd7df3fbefdbe742518839963d042 SHA-1: 62e8ff1decf11b2345c0ec8fd6af3e2db7ce54aa SHA-256: 6c137e0b65c6dab1b3495179c69e6f98d3309a3be5fe11e60a91a069d0ec152f
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, identified as a "PDF link farm" heuristic, suggesting a phishing or SEO spam campaign. The embedded URLs point to various domains, many of which are hosted on free platforms like Weebly and Epizy, indicating an attempt to obscure the true malicious intent. The ClamAV detection and ML classifier strongly indicate malicious content, likely a phishing lure.

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://jacksth.ru/strik?utm_term=john+deere+455+loader+specs PDF link annotation
    • http://kuroramogesok.iblogger.org/kodofefoz.pdfIn PDF document text
    • https://cdn.sqhk.co/razotefo/gjhPWgc/azarenka_wins_custody_battle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_6025ca5a6662c.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/bebagedoz_dufekusupet_gizus_toginasixa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386079/normal_5fe5896fda57d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419430/normal_6005758be0fef.pdfIn PDF document text
    • https://kagoxikefo.weebly.com/uploads/1/3/4/6/134649289/bodatikiwux-fedezibaxiver-jefimaxik-bijokevuwutak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478137/normal_5ffa3ddabea07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5ffa35743b773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_600f0eda70cba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370266/normal_60081e7d2483d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369161/normal_60214220504c8.pdfIn PDF document text
    • https://cdn.sqhk.co/noretokujazo/MLRbqhg/electric_trains_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/QhiiaX4/7081035352.pdfIn PDF document text
    • https://dedidebu.weebly.com/uploads/1/3/2/7/132740692/tenurabiravar_zebaladefebixos_nedakaju_bekamidobuvataf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevewodex.epizy.com/autophagy_and_fasting.pdfIn PDF document text
    • http://sefogubijisep.epizy.com/donald_barthelme_cuentos.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/restaurant_grand_opening_flyer_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/addictive_games_offline_android.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_off00012a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5A 5364 bytes
SHA-256: a9667ee8581b17d71bf24fa746170a1e18926153ca1556057bff67e204cd8942
font_01_sfnt_off00013c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C95 10672 bytes
SHA-256: 7f7f150a5fe2006b55161fb04986a78863e656211f54c16042ab7cfd704b87f2

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