Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6e1003dd6be6c8…

MALICIOUS

PDF

72.3 KB Created: 2021-03-02 15:18:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: d4388b3c5debef48756c57123c99b920 SHA-1: b8720b19566a507defb13baf553db26c694b5c88 SHA-256: ce6e1003dd6be6c8680164eba677dbca556528d7b1616fa507af83de937cb9b1
224 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, with one heuristic specifically identifying a 'free-download phishing' lure. The primary URL, https://jacksth.ru/award?keyword=samsung+washer+not+spinning+fast, appears to be part of an SEO-based redirection scheme designed to trick users into downloading malicious content. The presence of embedded JavaScript and the nature of the links suggest an attempt to exploit the user's trust and lead them to a malicious download or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/award?keyword=samsung+washer+not+spinning+fast PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451945/normal_60083a9a6620c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428052/normal_5fedabf670d58.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/5045855.pdfIn PDF document text
    • http://creditscoreusa.info/tadunesis6uknm.pdfIn PDF document text
    • http://idclick.cash/jefapeleruzavupepewuwe0qzv7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378152/normal_5fc854c6dc8b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muvelexadaw.epizy.com/pokemon_black_and_white_game_gba.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/72162072609.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/easiest_way_to_learn_english_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/kekifavaxeke.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/attagasam_movie_video_songs.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_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 5476 bytes
SHA-256: 0ea68733ba1970c953a59d9a9eaea49a8fa1c3a637fac2527b8ed679389ae8b2
font_01_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 10380 bytes
SHA-256: e9b73ff744f89989d3d562d8f313962f4fa1c706fd35e01e08c54ef3e09fdad6

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