Malicious PDF — malware analysis report

Static analysis result for SHA-256 6412407d6248a23e…

MALICIOUS

PDF

76.3 KB Created: 2021-06-11 18:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c36f889a186d429ec4e7fb1aa508e178 SHA-1: 51da6447d0922968ff352d87187bf2e77673ea36 SHA-256: 6412407d6248a23ea9de601c8b9fdcb8f86a7e3ce82d63813af861d5cefd6cd1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://jacksth.ru/123?utm_term=ntr+biopic+naa+songs+free PDF link annotation
    • https://sawagifavemon.weebly.com/uploads/1/3/0/7/130775832/cbbdd1ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_60138ddab326c.pdfIn PDF document text
    • https://tazeviguso.weebly.com/uploads/1/3/4/3/134339516/2408770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424982/normal_5fdb612ecf238.pdfIn PDF document text
    • https://tojoxuponoseb.weebly.com/uploads/1/3/5/3/135395296/5501598.pdfIn PDF document text
    • https://rizowexerezo.weebly.com/uploads/1/3/4/2/134265486/gipepafimeti.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/b86ca35d00f50a7.pdfIn PDF document text
    • https://tovadifu.weebly.com/uploads/1/3/4/0/134096489/zibofobuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_60c2db21d88bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472766/normal_6047446f266d3.pdfIn PDF document text
    • https://wisokovunali.weebly.com/uploads/1/3/6/0/136051549/743723.pdfIn PDF document text
    • https://sotinele.weebly.com/uploads/1/3/4/6/134640455/najemovug.pdfIn PDF document text
    • https://mufirurinonezu.weebly.com/uploads/1/3/4/6/134669904/2512825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444370/normal_601d130756218.pdfIn PDF document text
    • https://kivoranove.weebly.com/uploads/1/3/4/6/134679810/vosexetoviwuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/919366bb-760c-4423-909e-e778041bf51a/why_isnt_my_eureka_vacuum_not_picking_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430e7f81-c728-42da-936b-b2ae5de344ab/is_flowers_in_the_attic_based_on_a_true_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db7caaec-bafd-4a4e-a441-277a790a95cc/healthy_filling_foods_for_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06509c8-1d27-4270-bfec-a95cd8a27b29/kedadolovopoxota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4356d2c1-4e30-4f20-9eb7-a8c9afdcafea/vunajitubotafamifoforuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c62db65e-160c-4d70-b4a3-e6000a41403f/galokoluwumiboler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3cf60aa-3c95-48de-8b1c-44a04b9ce1bd/jotoxizofijipinune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a379d7f6-8cad-449c-bd74-2ff7a00c9e68/bupuneruxadasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b5c4cc-6517-4176-96a4-ea964d81439a/37195128073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19bca8a8-1381-48ab-9aa0-42f2e934fb0e/vililenijuwobutifotepetek.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_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 5260 bytes
SHA-256: 689f3d1820c1f812cfaf92ed62a24f5167d11938827aa706b45e32bcd06c2544
font_01_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 10744 bytes
SHA-256: 6f1098a95352df774d3bc5fc463ac89d1530b52e5bc8085bd0246c7afe8224e0

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