Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7944d394d901031…

MALICIOUS

PDF

87.4 KB Created: 2021-04-24 00:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9c126afcfe632e6dcaeeeeb055d12f44 SHA-1: 3fd2cb5c5d02a69fa57ad025c53d147b46cde2ea SHA-256: e7944d394d901031e1cc7a81a38af046dd461f8aca9d3a7a2745c75310c8240f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and using UTM parameters, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://xezojetit.ru/strik?utm_term=descargar+diccionario+biblico+cristiano+gratis+en+espa%25C3%25B1ol+para+pc PDF link annotation
    • https://cdn.sqhk.co/rifusofuwedi/pjcLjhj/pro_soccer_star_leagues_in_canada.pdfIn PDF document text
    • http://ig-support-service.com/what_does_it_mean_sub_zerowdxc9.pdfIn PDF document text
    • http://tikovg.xyz/osrs_ghouls_guidee8813.pdfIn PDF document text
    • https://mibuvenatevuwo.weebly.com/uploads/1/3/4/6/134607329/mokuvuv_vaxulafemika.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/phhia1i/living_wild_island_survival_skills.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/f1jjbrk/38482424849.pdfIn PDF document text
    • http://bioforce-co.site/simarezewipitegelusuwih0brt.pdfIn PDF document text
    • http://my-favshoph.online/printable_fairy_talesn8n2v.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/258171137197ifz2.pdfIn PDF document text
    • https://cdn.sqhk.co/kejopala/giajapx/4806905333.pdfIn PDF document text
    • http://liketsven.xyz/how_to_put_hp_envy_5530_printer_onlineqprr5.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/n9iaHmq/sisters_brothers_book_summary.pdfIn PDF document text
    • http://devicesprotectionforusers.site/complex_migraine_news_reporterjgvhx.pdfIn PDF document text
    • https://lajonomopizu.weebly.com/uploads/1/3/0/7/130739457/61a4a5a1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/13911850128.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/76971839092.pdfIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_f25ab47dd6704354893e2b31fd1723d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jijumupade/fopunuwedu.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/setaxasolofage.pdfIn PDF document text
    • https://13a2bf7a-7930-4518-a7e6-737bf3c0aa4f.filesusr.com/ugd/f5c1a0_4d5d32e8a6054a69a444ccf9e6ae9756.pdf?index=trueIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_2ebd7a5e32b64b6ba192c40d1112e8a2.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 5380 bytes
SHA-256: 23ddd088b251cbe45487472729d2f4f56fb8508d54f81654d251fad41c87aabb
font_01_sfnt_off00011872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11872 11736 bytes
SHA-256: 992db9f6325f68cc05c6548252077837f36853c130b7c7bb2ae9f214a9c5d436
font_02_sfnt_off00013e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E77 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176