Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dc83039ad6dc58…

MALICIOUS

PDF

87.0 KB Created: 2021-02-26 08:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 14d161264ac7fb150fa8b38be64bfd4c SHA-1: a774311b354bca890270fa8c5c63c8c9d8fe0109 SHA-256: d5dc83039ad6dc5824f402bb89f3ece3e5ed78f827975bf6c53e8c50948ef006
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure strongly indicate a phishing or malicious redirection attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jottigo.ru/strik?utm_term=what+are+the+7+stages+of+human+development PDF link annotation
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/5281873.pdfIn PDF document text
    • http://endi-itali.space/broken_heart_quotes_images_freekjsbj.pdfIn PDF document text
    • https://monoxoni.weebly.com/uploads/1/3/0/7/130738852/5287775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452594/normal_6019f0df11e2a.pdfIn PDF document text
    • https://lumigoxodavi.weebly.com/uploads/1/3/1/6/131606620/sujanigujubuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_5fe97cca76714.pdfIn PDF document text
    • http://allrecipes.pro/lenosuzugebitudafakor8ebhi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_5fd85c83506d5.pdfIn PDF document text
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/valobezodowa.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/70dbc53cc40.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/vexugebegabebebavagutosrwn03.pdfIn PDF document text
    • https://sowikidorazeku.weebly.com/uploads/1/3/5/3/135306740/segujesogo-rafagodiza.pdfIn PDF document text
    • http://redita.fun/bubble_popper_app85ssn.pdfIn PDF document text
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/nopefev-lowuvitu-rerezekopax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sepawi/boditasolo.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/ajax_form_data_php.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/nerenawidudufede.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/lutajesepukifof.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/gijozarefiberiwisepavus.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_off000116d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D4 5608 bytes
SHA-256: d9e5afd6e41d9116047f35d0a742555d32865c2417fc4a7f83383f6c2052f04a
font_01_sfnt_off000129d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D9 10724 bytes
SHA-256: b0e1f700bfdc66db9640d79310bda92d61d920daa2d3c7377dca8d873e7d8141

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