Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2ec618e59f3fa3…

MALICIOUS

PDF

81.6 KB Created: 2021-04-04 20:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1d05fb4c5e2ab5d79aa00d68cdbb216d SHA-1: c18f60daf59c9818f89d48d4fb1616a50e2dcd99 SHA-256: 5e2ec618e59f3fa363df7364d7b7c0a239ee8c290b1c6bbc4480a472cfad385b
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a high-severity heuristic indicating it's an SEO redirector link used for phishing, specifically a 'free-download phishing' lure. The ML classifier also strongly flagged it as malicious. The primary IOC is the redirector URL, which likely leads to the download of a malicious payload. No scripts were extracted, but the PDF structure and heuristics point to a common phishing and malware delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/aws?utm_term=does+george+foreman+grill+reduce+fat PDF link annotation
    • http://tigefezatolipeb.iblogger.org/bulerejetazeku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387590/normal_600331387948e.pdfIn PDF document text
    • http://levelupguild.com/76428327962r9dxr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_601bb0fcbf56c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424027/normal_600a6b3c57804.pdfIn PDF document text
    • http://help-igcopyright.xyz/del_arte_de_la_guerra_maquiavelon3unz.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/i1hfkhi/vexed_crossword_clue_11_letters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391636/normal_600271ba2fb7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490127/normal_5fe54ff7bcb4d.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/ap_reorganisation_act_2020_in_telugu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446286/normal_6001bf96c6b21.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/11806877920.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501037/normal_5ffbdfc091c34.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/hf95NL1/battle_rivals_review.pdfIn PDF document text
    • https://cdn.sqhk.co/fakosopalo/Cggjb7w/best_voice_chat_pc_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zolorame.rf.gd/tararefes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 5224 bytes
SHA-256: 97a43ccff1dc8d8805a33079251b3f3a437303e23d42cce91082e429a708344c
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 11792 bytes
SHA-256: a2280dd016652d9c2b1be7bcf1334e06bbf82086a20e02adac1d408d58723261
font_02_sfnt_off00012b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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