Malicious PDF — malware analysis report

Static analysis result for SHA-256 db349a51eaa7c80c…

MALICIOUS

PDF

67.8 KB Created: 2020-12-08 23:04:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a41cb8c3269442175eb19afaff14b643 SHA-1: 378407b5caa09f9d2631c451e377860dbd10e801 SHA-256: db349a51eaa7c80c5a73e1f044d633dbfd3d2f3fbc2cea5deefe3526e283227f
222 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to a URL associated with phishing and a link farm. The document body, though heavily obfuscated, contains text related to software downloads, reinforcing the lure. The presence of multiple embedded PDF links further suggests an attempt to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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://cctraff.ru/123?utm_term=despicable+me+minion+rush+apk+%252B+data+offline In PDF document text
    • https://gexeperi.weebly.com/uploads/1/3/4/3/134348656/rarokitudake-rezusanitali-zimuvunimujosu.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/3235482.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7f8774-2dfe-4474-8e1d-48c7ec9c28b1/xiraborifenidudokig.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd745bcb0228a2824d01/t/5fca1a1a414f5e3523814d93/1607080485353/fishing_clash_gift_codes_september.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd9b8ef7301f8b108504/t/5fc368989b1ed03538489919/1606641817332/numekilidarodisemaxuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/643a28f2-ca99-45c6-878e-3427a149fb37/78128331481.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf49fdf81c9a2a0c9830b4/1606371838488/wazowokezojidaripilifa.pdfIn PDF document text
    • https://s3.amazonaws.com/newopetusam/94502918143.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1ceb7bdb33045eec8b031/t/5fc37a7d9b1ed0353849aab6/1606646404955/57714021092.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc37d0aec917750a3e81c42/t/5fcb4b1e190ee82df8da9ef0/1607158559232/coin_master_hack_without_verification_code_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eed3d76-f23f-4d5c-91b4-d37520993646/18172494195.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_off0000cbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBE 5600 bytes
SHA-256: f9380d1dbe6e18a0554a10507a9356ae77585d4c774d280684447fea306d051f
font_01_sfnt_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 10516 bytes
SHA-256: a6cf99a3422e24dc50ca275bebaf19625777f3025b91951daca50c1a175d184f

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