Malicious PDF — malware analysis report

Static analysis result for SHA-256 3855b03993279fe2…

MALICIOUS

PDF

77.0 KB Created: 2021-03-16 12:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8331a710ff57c5c71bd234434f70e913 SHA-1: c52a803e9011081e3acc93f1ce95908d821ec623 SHA-256: 3855b03993279fe217e1db9f4b690aee569309923b2354b34b6adc57124d98a4
136 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded URL that acts as an SEO redirector, specifically designed to lure users into clicking on it, likely for phishing purposes. The document body, though partially corrupted, contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for creating malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/strik?utm_term=what+is+the+definition+of+external+structure PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422148/normal_60076e43d4ae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_603fd8179925d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461484/normal_5fc5ca2729893.pdfIn PDF document text
    • http://gasurorir.sportsontheweb.net/79870406256.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485440/normal_5fe06ec6041e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369927/normal_5ff9fb00f20c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495843/normal_5ff2646be190b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5fe64fbeb436b.pdfIn PDF document text
    • http://jegoxijiruvika.22web.org/68252066006.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/xopugup/zakurof.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/51883356831.pdfIn PDF document text
    • http://damowepoko.myartsonline.com/9687287023.pdfIn PDF document text
    • http://nenutufap.epizy.com/list_of_adjectives_words_with_meaning.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_4397ed712ee245a3b2fc808266d76ce1.pdf?index=trueIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_664619fa90704d4d835f0e8fdb6a6ac7.pdf?index=trueIn PDF document text
    • http://kesufelitam.rf.gd/sandra_cisneros_short_stories_list.pdfIn PDF document text
    • http://xotaferuju.myartsonline.com/coreldraw_2020_shortcut_keys.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/laptop_video_calling_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/how_much_does_mcdonalds_pay_an_hour_2020.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_2745501dada94cd88d0558dcee432ff1.pdf?index=trueIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_3a354214afc14b17a4120044e1019a73.pdf?index=trueIn PDF document text
    • http://juruzozesema.epizy.com/philippine_police_blotter_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/vikokamuwuzewojusu.pdfIn PDF document text
    • http://baxewape.myartsonline.com/how_much_are_beats_during_black_friday_2020.pdfIn PDF document text
    • http://fawivemepogu.epizy.com/ignou_date_sheet_2019_ba.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_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 5188 bytes
SHA-256: 28b58801c0142340177d88aca1631603b80851f1e3de2006844b3c0a06b80b2f
font_01_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 10228 bytes
SHA-256: 7438fe338c228212ae0fb29eaa77ce0d8dc3c046737ce4dd312ba9b64815896b