Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ecf862d9c004f3…

MALICIOUS

PDF

68.9 KB Created: 2020-11-21 23:15:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd74b9bfd7ccb5884c2a6cf19dd6b0b6 SHA-1: 587dd49713d1b477684c2acf9cdb7ef8b030419b SHA-256: f5ecf862d9c004f3c8b89a65fb869f7cfbd3bc8e70c899e85859c3d9418c3563
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The embedded URLs and the overall structure indicate an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafftec.ru/aws?utm_term=fraction+word+problem+worksheet+for+grade+4
    • https://koworuvixoduto.weebly.com/uploads/1/3/4/3/134352933/fofigemazuzew.pdf
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/9c521.pdf
    • https://putoluxadap.weebly.com/uploads/1/3/4/7/134734973/gizasotoj_fewuzogepawu.pdf
    • https://jiwozipepogi.weebly.com/uploads/1/3/4/4/134462700/3145279.pdf
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/dagowokujifemonul.pdf
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/sovumuvidizisi.pdf
    • https://fuwozubasuzej.weebly.com/uploads/1/3/4/4/134473550/4a35d02ba0b31.pdf
    • https://pavaliwakugaban.weebly.com/uploads/1/3/4/3/134373235/102366cfb2f2d.pdf
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/jelaguzifalogoxixiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/af0e4687-b1a0-408f-a2c5-0db10f9944d9/2666799335.pdf
    • https://s3.amazonaws.com/warapagefasovi/witch_mod_minecraft_1.7.10.pdf
    • https://uploads.strikinglycdn.com/files/6ac7254d-90f9-4e54-97bc-c2a08bb6a8d0/keranirakaladum_lyrics_in_malayalam.pdf
    • https://uploads.strikinglycdn.com/files/fc381ca2-b4d0-40da-aac2-ca4a06dbd4e0/navoxodogudod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd65.bin
54386fccb5d214cd7f59b1b4370ccc8716589d1822fb72953c8e40a901082618		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 5908 bytes
font_01_sfnt_off0000e16c.bin
1ec221bc9f2d760159db4a2b8d41a0ef9f815e22dc2461addf71787ed9327467		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 10952 bytes

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