Malicious PDF — malware analysis report

Static analysis result for SHA-256 405844e22b3eef90…

MALICIOUS

PDF

73.1 KB Created: 2020-12-17 08:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fd47696aa7dfca4b9fd7777ce65488c2 SHA-1: e6b017fb04e93e163b188836ec2c3439f79cea6b SHA-256: 405844e22b3eef90a08751ff07f98c9904e03e6267fd52e4125a9d9990c7c3cf
192 Risk Score

Malware Insights

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

This PDF file contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF as malicious with a high confidence score. The document body, though partially obfuscated, suggests a lure related to educational topics, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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://traffking.ru/strik?utm_term=post+graduate+project+topics+in+biology+education In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5fa18a5fe97c1.pdfIn PDF document text
    • https://mofalapew.weebly.com/uploads/1/3/4/3/134307760/subedif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5f9c62f4e64ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_5fb2e8a5e26a6.pdfIn PDF document text
    • https://viwekaxirudadax.weebly.com/uploads/1/3/4/7/134700275/sobarevegopajatamur.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/buzasure.pdfIn PDF document text
    • https://palukenibimel.weebly.com/uploads/1/3/4/4/134401756/2471259.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389353/normal_5fd047eb30611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_5f9179c848de0.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/534d5821-6271-4cec-ac20-4f13863b30e7/7725508081.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/ruwilebeborotatofuwevu.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/echoes_in_the_darkness_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75c27e8c-0fe4-422d-a311-ad22e916645a/namawurimusam.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_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 5560 bytes
SHA-256: e3df8b97e4fa73abb0babafffa10f2f740437cb3113fb5debfcfb703737e62c1
font_01_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 10836 bytes
SHA-256: be9bdd6a823ec2807da531135a8edbb0f327c66eb7e99390142384fd78d4ad24

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