Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64611573215d9d5…

MALICIOUS

PDF

70.3 KB Created: 2021-02-18 01:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b291609951ab8a71ee228af02ed9a386 SHA-1: 4a3cff5662661ab476bfebbaf54bf7d4e543937e SHA-256: e64611573215d9d5661b95eef097a9f8d87523a262c90332611011f6211f6f6f
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to disposable hosting services, and one directly to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/strik?utm_term=what+is+a+curriculum+based+assessment+in+special+education In PDF document text
    • https://cdn.sqhk.co/lojibuwe/o6idTja/xulegevovixafupizewune.pdfIn PDF document text
    • https://vopukuno.weebly.com/uploads/1/3/1/3/131383764/2184063.pdfIn PDF document text
    • https://gipavenox.weebly.com/uploads/1/3/5/9/135966662/f58c5.pdfIn PDF document text
    • https://wipiwabe.weebly.com/uploads/1/3/4/4/134438476/9104344.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375885/normal_5fc8a229918a1.pdfIn PDF document text
    • https://sedovabopidixo.weebly.com/uploads/1/3/0/8/130813108/4a7cb6.pdfIn PDF document text
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/rotanekoxinur-duwowonaxabogav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5fe1e8fee9012.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/kgfqtgf/destiny_s_child_cater_to_you_free_mp3.pdfIn PDF document text
    • https://vasejafarobi.weebly.com/uploads/1/3/1/4/131454155/vuvodipelesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_601affb37024e.pdfIn PDF document text
    • https://xufefizomuziz.weebly.com/uploads/1/3/5/3/135346589/karijakaruj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dogurof.epizy.com/rumafaloz.pdfIn PDF document text
    • http://sesunofopum.epizy.com/advanced_english_vocabulary_test.pdfIn PDF document text
    • http://muzafevabuma.rf.gd/vovij.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/gevid.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_off0000d500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 5468 bytes
SHA-256: 1f865d80c35080a621abbbc312e21003a96157eb19e6e0d3c1449a5d064e864f
font_01_sfnt_off0000e770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE770 10684 bytes
SHA-256: b418109fb3fb4c1905dd462b8a98d3c98078a44d680129ee88a58add076131e4

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