Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef082b7999ece20e…

MALICIOUS

PDF

89.1 KB Created: 2021-02-25 10:49:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cb4f5339068e3887470ce72dae173c44 SHA-1: 2f0e1cdea51beec41daa0b50cce4571987e525c4 SHA-256: ef082b7999ece20eccbf9546f52a2fd64c5b878f17e3dac3c91f0847780dcaee
244 Risk Score

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 services and are likely used for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests a redirection or download attempt.

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/123?utm_term=livros+esp%25C3%25ADritas+para+ler+online+gr%25C3%25A1tis In PDF document text
    • https://xinifusat.weebly.com/uploads/1/3/4/3/134321574/4fc9be.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/oldways_mediterranean_diet_brochure.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/73245484169.pdfIn PDF document text
    • https://muwirejevom.weebly.com/uploads/1/3/1/8/131857435/giwabowixiras.pdfIn PDF document text
    • https://xiwupezarevapo.weebly.com/uploads/1/3/2/6/132681984/lurave.pdfIn PDF document text
    • https://gepogixuzusesil.weebly.com/uploads/1/3/3/9/133999736/b43ed7038e850d.pdfIn PDF document text
    • https://gopadafuwidu.weebly.com/uploads/1/3/0/7/130740623/rudixopidupive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448744/normal_60111f5840734.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/how_long_to_put_jerky_in_dehydrator.pdfIn PDF document text
    • https://bigevavez.weebly.com/uploads/1/3/4/0/134016854/govivefilaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_5fd5f08f78e5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471236/normal_602f7d85501b5.pdfIn PDF document text
    • https://bifugojatomawak.weebly.com/uploads/1/3/1/4/131437093/8d4e78ca70014a.pdfIn PDF document text
    • https://fofawuparojimi.weebly.com/uploads/1/3/1/0/131070926/worojifosaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedaremix.epizy.com/34398051990.pdfIn PDF document text
    • http://nijetazum.epizy.com/75474849284.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_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 5276 bytes
SHA-256: b8bdc1c7c7c89e723a75c9c99b27cea91fc45255dd4f547fcacc0ae06048d01d
font_01_sfnt_off00012da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA3 13336 bytes
SHA-256: bb117ea04c843bc0add88d6b5743442c2ef74e616fffa6a1af387484ca27733c

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