Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d18772d03a534d3…

MALICIOUS

PDF

73.9 KB Created: 2021-06-06 22:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7dec44387ebe26f7008e8e6a838ebefa SHA-1: 6f7ac3b3563195edf0180dbaaa08fa908db172d9 SHA-256: 9d18772d03a534d3ee153e38af964ab4b4a9ed0d6ac5ec35b94356c2cbf828f3
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 large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://botokaw.ru/123?utm_term=lab+safety+cartoon+worksheet+pdf PDF link annotation
    • https://jumalevejuza.weebly.com/uploads/1/3/4/6/134690248/palazam_tezirolad_zoruxe.pdfIn PDF document text
    • https://wigazasadus.weebly.com/uploads/1/3/5/9/135974004/627358.pdfIn PDF document text
    • https://xasugalepo.weebly.com/uploads/1/3/4/3/134311154/fofitesisufe.pdfIn PDF document text
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/pekevawamometi-guzemon.pdfIn PDF document text
    • https://reribowin.weebly.com/uploads/1/3/4/6/134643330/894161.pdfIn PDF document text
    • https://nibevomixosu.weebly.com/uploads/1/3/4/1/134108547/5600200.pdfIn PDF document text
    • https://waxopudiva.weebly.com/uploads/1/3/4/6/134695928/patusexabij_revuze_soduzojevutavol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_606e669476811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476273/normal_6047fb5bc31e8.pdfIn PDF document text
    • https://xefakebeka.weebly.com/uploads/1/3/5/9/135993821/bavetog-jazojolixevave-regav-kezufofemadij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459025/normal_6028b31e7a8c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491723/normal_6068933ac208f.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/sulaxizafigezoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480408/normal_606e5d315492c.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/c9cc8dba-a85e-4578-aa58-ff58f9405ac5/xoriruxef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b71e324-7a0d-4617-8a41-7a7677d593ae/31456654866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0879746f-2492-48dd-b623-a9651e113247/yashica_mat_124_repair_manual.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_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 5552 bytes
SHA-256: b509dbf79149013dc7d7201e46b73b1403b0f04660380910fbe0f9d5140a22a6
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 10724 bytes
SHA-256: b6e7ed69bab79cefb59cca2e7cb8aa8f35f61d621cf2692c437be1285a2c3ef3

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