Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5453382464e740…

MALICIOUS

PDF

74.8 KB Created: 2021-03-12 16:10:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 50c2baa754f7573e8dbfa8e77613d868 SHA-1: e2a2147a5923e0748ba3d3d8ad86f20952d62c68 SHA-256: 5f5453382464e740555532607928f56eec938fb7eb16f67d387631a0df616891
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting and are associated with known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or scam content. No scripts were extracted from this sample, but the link farm behavior is a common tactic for distributing malware or leading users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/award?keyword=ielts+writing+task+2+pdf+answer+sheet In PDF document text
    • http://dibiwarisogix.mygamesonline.org/venture_capital_investment_process.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/erjqiaP/77918340934.pdfIn PDF document text
    • https://cdn.sqhk.co/fukafodifi/ihiglTy/guserogefovuvinilinom.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/bgjpw3w/salufopumunu.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/BiiShg2/labefuva.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/h2ihw71/lutukikifo.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/F98sQje/46852070752.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/06a2888c-6c0e-4fa3-b403-a73650e49883/mubodefoto.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_7479844e36034db1931035f9b06d97bd.pdf?index=trueIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_6c41a11d54334200babba0748a77dbec.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_dc506ccd402d4550aa09760866fa8720.pdf?index=trueIn PDF document text
    • http://kesolimasakifi.myartsonline.com/agriculture_durable.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_c5d61ff014554366aaf996593e390b6d.pdf?index=trueIn PDF document text
    • https://ae9cd3fc-a2ed-4114-aa96-dd53a7e96ab4.filesusr.com/ugd/22cbe6_bd9c1aa5c1ad482aaae8e0323934d5d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e686e9-21e5-4643-bfb5-1bed684557d9/wd_portable_elements_vs_my_passport.pdfIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_818680df0694427da3ecbc67d05f654c.pdf?index=trueIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_f3c65a15cb974fb1ad238230c276a68a.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 5204 bytes
SHA-256: 5b86af3ea669c0a83157b269dcc413c8b40196a969d34923a3502cb6598e6c98
font_01_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 10408 bytes
SHA-256: 9312fe07942553fd3c07d9ecc136d8498860edede7d29283fa9369804b12a464
font_02_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.