Malicious PDF — malware analysis report

Static analysis result for SHA-256 e585a55956f07a9f…

MALICIOUS

PDF

81.7 KB Created: 2021-02-14 22:16:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0271a354f8f7d4636d9ff0e13eb28628 SHA-1: d5c0932a2f7350fdd4238c53618f50df12d06f76 SHA-256: e585a55956f07a9ffd55346431dbb6171eb1f5c13255f844dc18508e4b5222e2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a likely attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to host a large number of links on potentially untrusted hosting.

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
  • 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://maypoin.ru/123?utm_term=amistad+continuation+high+school+indio+ca PDF link annotation
    • https://cdn.sqhk.co/wiluxuko/igeL8yv/sasuduxosamugejuxividuxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421366/normal_5fe36a1077a9b.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/d8hbhaG/karelasojenagatip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_601bf9737d8da.pdfIn PDF document text
    • http://bamasadukarudam.iblogger.org/australiansuper_annual_report.pdfIn PDF document text
    • https://cdn.sqhk.co/texivewa/bsTPlie/setiputuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_60221a5541b1f.pdfIn PDF document text
    • https://cdn.sqhk.co/japivuwali/i7Kjic9/62652304277.pdfIn PDF document text
    • https://cdn.sqhk.co/bimazizuxu/n1idhgk/1_image_4_words.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/risisipajole/inverse_trigonometric_functions_worksheets.pdfIn PDF document text
    • http://solatilexi.epizy.com/mifapa.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/white_and_blue_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/dubivo.pdfIn PDF document text
    • http://liwubujuwu.epizy.com/wiremibuguzuna.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/mage_the_awakening_2nd_edition_free.pdfIn PDF document text
    • http://borobosen.rf.gd/agricultural_research_proposal.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/astral_projection_books.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_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 5248 bytes
SHA-256: a174a01c1e8ae90fb003eb39265d8f890eda21e60a4fe2511a2e825f9d4d71aa
font_01_sfnt_off00011322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11322 11140 bytes
SHA-256: a90f17da6f0da7ec100b4e0b5f1c1ed949c5f88ae622893a78eacb53dc188589

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