Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1825e0c6bfca747…

MALICIOUS

PDF

72.2 KB Created: 2021-02-07 07:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9d918d63ee85fdd8c27ca3faa8bce418 SHA-1: c77222b20c011ac4c3c0937753079d1c68ccdff6 SHA-256: d1825e0c6bfca74771fd1ecee1e243a538b58928cda6366df2ad9dfd273575ba
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 URIs pointing to external websites, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to search queries, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=is+a+sweet+potato+a+vegetable PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470687/normal_5fcb64af345c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401973/normal_6008f38cb9401.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473359/normal_5fee7d5744649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_600dbef117e28.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/38f6c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_5fdc2a373669c.pdfIn PDF document text
    • http://sejapamuji.22web.org/97870407128.pdfIn PDF document text
    • http://dasonudulikuvon.22web.org/52575670523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_601f65096587b.pdfIn PDF document text
    • https://bidubemawekewar.weebly.com/uploads/1/3/0/8/130815124/ea87e4c1298d.pdfIn PDF document text
    • http://wabuxon.iblogger.org/yanny_or_laurel_right_answer.pdfIn PDF document text
    • https://bujefodamefizup.weebly.com/uploads/1/3/1/0/131070612/64c8d348e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_601f14432a7d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_5fe7a15b0acfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393041/normal_5fe68d814e1c5.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/zifilobesumafi/four_veronica_roth_ebook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/perform_ad_hoc_projects.pdfIn PDF document text
    • http://pifaramurul.rf.gd/wikuluxa.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/kinipafegiwaxone.pdfIn PDF document text
    • http://jabujiwotase.epizy.com/xamunaxuzolijupoxolulebef.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/37697263605.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_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 5120 bytes
SHA-256: 85cbb2adf1bdb55df8fce79db2318f14b87491cf31ca2ae1371d571f89bc1a93
font_01_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 10352 bytes
SHA-256: 02f85e6233dbb09d5e7c4a06f2bf1027ae97593654daf57b6113b90c2529be44

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