Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d1c910c304142f…

MALICIOUS

PDF

73.8 KB Created: 2021-02-13 17:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 972ba294442090119c91f155cd558909 SHA-1: dfdf8190fb3890de22568f061700b32cecbfa8f9 SHA-256: e7d1c910c304142f71d9bfcc967ca53fc053abee368bc4e271be0f0f68b446be
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm designed for SEO manipulation. The presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicates malicious intent. The document body, though heavily obfuscated, contains text related to 'Leer el coran en ramadan', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/123?utm_term=leer+el+coran+en+ramadan In PDF document text
    • https://zedabobosarafon.weebly.com/uploads/1/3/0/8/130813357/3625389.pdfIn PDF document text
    • http://legionmone.xyz/feminapasosinelujekojcnmyr.pdfIn PDF document text
    • http://cyberlife.store/today_s_weather_report_jammu_katra4uelc.pdfIn PDF document text
    • http://flylovel.com/bailar_bailar_line_dance0c2qc.pdfIn PDF document text
    • http://parrrtner.xyz/world_market_rugs_9x12jxxpu.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/endless_night_novel_downloadtga8q.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/361312.pdfIn PDF document text
    • https://namutaborizelo.weebly.com/uploads/1/3/4/7/134766338/8077088.pdfIn PDF document text
    • https://fezekisovo.weebly.com/uploads/1/3/4/6/134661064/2eca01ffe.pdfIn PDF document text
    • http://interstart.online/jifujuxpvwu.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/salosibejodod/sewojewopudolazuvimezel.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/susafanunevirikugiba.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/4662625238.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/vesutobevexosijave.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/49115455694.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_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 4848 bytes
SHA-256: 3ba3eb3d37a4e66f9958db7ebca6fa98074728704f64c5a6cb94737ec7a2ca75
font_01_sfnt_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 11348 bytes
SHA-256: b30b8b71716d2eea9322b97bc0a84ffbc3732078619fb3bc0751b390a5425ef8

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