Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad7608ee27fa5a4…

MALICIOUS

PDF

76.1 KB Created: 2021-01-20 09:39:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f8d77e55063720fab26cbfb134237cf5 SHA-1: 4280bbe20cb22c2020c70ff6aed42ee5afc88f1f SHA-256: 5ad7608ee27fa5a47483f62c17f16ef42a86f2fb77c248370b8366831e77e7d2
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is an unofficial transcript, a common lure for phishing. The presence of embedded URLs and the ML classifier output strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://traffmen.ru/123?utm_term=bellevue+college+unofficial+transcript In PDF document text
    • https://site-1194273.mozfiles.com/files/1194273/42052696844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_5f961694a8a2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372702/normal_5ffbf017e8ab5.pdfIn PDF document text
    • https://site-1200104.mozfiles.com/files/1200104/xazabizosejikefo.pdfIn PDF document text
    • https://site-1238423.mozfiles.com/files/1238423/sesimigiwutapujera.pdfIn PDF document text
    • https://site-1174269.mozfiles.com/files/1174269/tasirizam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489245/normal_5fd14735b6f57.pdfIn PDF document text
    • https://site-1257425.mozfiles.com/files/1257425/banner_saga_guide.pdfIn PDF document text
    • https://site-1179234.mozfiles.com/files/1179234/cfa_level_1_books.pdfIn PDF document text
    • https://site-1177122.mozfiles.com/files/1177122/kopexalurojorowegavavaze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_5fe8ea7344143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5fd1d363a5505.pdfIn PDF document text
    • https://site-1176001.mozfiles.com/files/1176001/zatavusitufejugesej.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/dowesitobuga/copyreading_and_headline_writing_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/wusofezomaneba.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/63775443749.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_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 5292 bytes
SHA-256: 6822ac14df4d2354386206a0463bf6121989cb656bb02e23e24197fe156960e2
font_01_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 11312 bytes
SHA-256: 7ad5d82003a874e2cbf28f396523dd1bc10811456f53209099bdb8e50d698d31

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