Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d855e2381850d1f…

MALICIOUS

PDF

81.2 KB Created: 2021-04-04 06:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8770520120a064b14f5928fd9a98712a SHA-1: 75d91fef7ed7232f25b55acbe4a540e9b44e5c8a SHA-256: 4d855e2381850d1f3830035a6f89b744a8612e6ccc9af4e3bdcf65558ea2ed9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=what+is+the+most+profitable+job+in+bloxburg PDF link annotation
    • http://lnstagramverifiedsbadgeform.com/kotezawafuxazoxawonoj1v4ta.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/xawizej-fapidifujaba.pdfIn PDF document text
    • http://indital.fun/48787759639v1vdj.pdfIn PDF document text
    • http://rmk4sale.xyz/22232867472lho96.pdfIn PDF document text
    • http://todiluz.22web.org/how_do_you_get_a_job_at_salvation_army.pdfIn PDF document text
    • http://sandwichhq.club/fudejafeguwejtjuw.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/FiaFhcO/planner_microsoft_productivity_project_management.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/ORQhhlo/vosozizogefuvaz.pdfIn PDF document text
    • https://kapiromus.weebly.com/uploads/1/3/5/3/135345701/jutakizokalapebixo.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/eijEXja/59523907441.pdfIn PDF document text
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/ranajunimakibugakodu.pdfIn PDF document text
    • https://cdn.sqhk.co/gopepilexafi/iijjebS/99627942559.pdfIn PDF document text
    • http://repair-foto.ru/pharmacokinetics_made_easy_birkettpmuqq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_b9ab325abe2a47a2a1f2b5956da9f6a0.pdf?index=trueIn PDF document text
    • http://buxazub.epizy.com/94515467232.pdfIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_4ad866a1fc144a998e6c27d87675d2ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/38413842815.pdfIn PDF document text
    • http://rapudipawuv.epizy.com/rerum_novarum_summary_of_content.pdfIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_cce3d3f6836c4c829f67e72bb5a607cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dezajok/central_limit_theorem_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/joguzejufevori.pdfIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_2ca9f9cd2fcb44308a084093a29a2af1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dofufiri/mogebekadubuteweta.pdfIn PDF document text
    • http://pogukazew.rf.gd/lagu_whistle_blackpink_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/toshiba_bluetooth_stack_windows_10.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_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 5612 bytes
SHA-256: c5eff7ca8f780df9fc76e0ea6e287763c7deb39b851b19ff79571ba83d281e11
font_01_sfnt_off0001107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 11276 bytes
SHA-256: c8a385de80bb40c9f8f3fe25dcf55d26cec7ec50230d377fd5425cebe7e3976d

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