Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1bd4c4ca549b3e…

MALICIOUS

PDF

77.6 KB Created: 2021-05-30 20:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b2788b360455380f34cf9be594e7cb1b SHA-1: 56a2d5c18a1969f61b6b6986c5cdfe1efbe0699c SHA-256: 5c1bd4c4ca549b3e1862f45170f8437c0274e27a65ca835674bbfef0ab5aefb4
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized redirectors, indicating a link farm or phishing lure. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK strongly suggest a malicious intent to redirect users to potentially harmful sites. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

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.
  • 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.
  • 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://nipisod.ru/123?utm_term=iridium+phone+number+format PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366313/normal_5fcd39032fb05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467561/normal_600020e15fc9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_60565f5a7ebd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392439/normal_60401ca513d61.pdfIn PDF document text
    • https://zoparidozuxeb.weebly.com/uploads/1/3/5/3/135390671/756da8c5d.pdfIn PDF document text
    • https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/solosujenu.pdfIn PDF document text
    • https://zetizisoxaw.weebly.com/uploads/1/3/4/4/134498522/4757.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491686/normal_5ff57d6578272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5fd1d656163e9.pdfIn PDF document text
    • https://xinejusitap.weebly.com/uploads/1/3/4/6/134630468/7901199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_603fd86119894.pdfIn PDF document text
    • https://mijawogutudegi.weebly.com/uploads/1/3/4/3/134374589/4702377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408873/normal_60270f5f57c81.pdfIn PDF document text
    • https://jetizapu.weebly.com/uploads/1/3/4/3/134371104/vujefawip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5fdead69c3a99.pdfIn PDF document text
    • https://fosapiluni.weebly.com/uploads/1/3/4/6/134653401/e072bf1fad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483388/normal_5ff62106237eb.pdfIn PDF document text
    • https://detaliwaka.weebly.com/uploads/1/3/4/3/134340587/54e6b6ef32d41.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://uploads.strikinglycdn.com/files/e8a8b08e-2a3c-4fde-8fe9-5f9e1159db77/descargar_libro_de_el_abc_de_las_instalaciones_electricas_industriales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60dd7384-003e-445e-a5f2-2069e74f8f71/90010527059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c156bf39-af2b-40e2-aa02-69fa4b688bfc/45597925280.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 5028 bytes
SHA-256: 795873a88fe4ab4f53f7a3527a6703a945dcbc2a113036f31c192aa463f72ebe
font_01_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 10500 bytes
SHA-256: 6a5e804312f220af71d3ba919a15fe268737091fe928abd12c7d25be69477a07
font_02_sfnt_off00011955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378