Malicious PDF — malware analysis report

Static analysis result for SHA-256 e548754556ce26a9…

MALICIOUS

PDF

74.6 KB Created: 2021-03-21 05:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3ccf8d5b6e61e9d5f8a19c9b5c219eac SHA-1: 92e77bd13347498a0c443a52407510d5de336f84 SHA-256: e548754556ce26a978233297adb6d31d6e6c93598cc2b67c23b0b171b49d30df
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/wix?keyword=puzzling+pedigrees+answer+key PDF link annotation
    • http://zedateve.mypressonline.com/bejizeluwawinijeviginikos.pdfIn PDF document text
    • https://fokikemapusa.weebly.com/uploads/1/3/1/3/131398543/ce144c2692d716d.pdfIn PDF document text
    • https://gekaketiba.weebly.com/uploads/1/3/1/4/131455198/78130d35.pdfIn PDF document text
    • http://rixuliketasaban.mywebcommunity.org/13661911215.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/oreilly_python_books.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/8643672.pdfIn PDF document text
    • https://kokubuzo.weebly.com/uploads/1/3/4/0/134017800/pegawanumuwiti.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/casio_hr-100tm_feed_paper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zipemoluligera.myartsonline.com/candy_candy_final_story_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef4a023-bb79-4673-b84f-8cab43498f14/nada_blue_book_for_used_cars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82366cda-09a8-427c-a91b-b196bdadf93b/nc_drivers_license_suspension_check.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d0f852-ad39-4b47-8e88-17733803dc7e/vorulumelolide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcaa360a-4dc9-494e-8a2e-530abb56b9f7/30459210430.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/magic_tree_house_55_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/057b512f-3fdf-4e3a-a0ed-7b5cee9ac652/98839663945.pdfIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_2d29e86bd64d486e884a14cb5edd8d8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f5b3891-14bb-4f7d-89b8-43e2f0aae1bf/zekuletevizewuxevorepuso.pdfIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_4d4f7b708a5a4e0cbda758e251941beb.pdf?index=trueIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_590d20f2c7b4423180910090e8ba3c96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/149fde15-f8ec-4150-badb-24cfc2877f97/98_lexus_es300_headlight_adjustment.pdfIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_8d73298fb7ef48299100b7dcb837b52b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6278eee5-f14f-4e06-a051-ae485dcfb27b/majazapewawonirutatok.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_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 5436 bytes
SHA-256: 9315adb6651eb0ed03b71f3fa4723ccad0d2c26b5951933e7a1983b6ab9dc511
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 10992 bytes
SHA-256: acd0a66099cd138065c4aeb618e332c4800f9e50139f507c5ff4ee079add62ff