Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb7f822e3ae9bfb…

MALICIOUS

PDF

112.0 KB Created: 2021-03-05 07:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8a4ad0a302202f4b3ac2cc07e9fb002e SHA-1: eaceb318e04e8f8f0ee2ddd40beca810ed9b99a0 SHA-256: aeb7f822e3ae9bfb865b5ff8a4bcb51f36df7c34fcd8004796d380ce2fbfc485
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The presence of external URIs and the ML classifier's high confidence score further support this. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or redirection attempt, likely delivered as a 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://druttle.ru/123?utm_term=python+dictionary+values+greater+than PDF link annotation
    • http://carins.info/4969486041949nd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_600c35ad627c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402503/normal_601b43b2ca630.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404955/normal_6005279aa35fa.pdfIn PDF document text
    • http://usejus.pro/descargar_whatsapp_transparente_apk_ultima_versionn097a.pdfIn PDF document text
    • http://copyright-supporthelp.com/singer_confidence_quilter_tension_problemsha2ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487935/normal_60230be24d6f8.pdfIn PDF document text
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/jalikak_jedigakuxeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417813/normal_5fd6c543d8339.pdfIn PDF document text
    • https://jazazigiw.weebly.com/uploads/1/3/1/3/131398077/nuwuzesobejakituwej.pdfIn PDF document text
    • https://befewegumezozem.weebly.com/uploads/1/3/1/4/131453636/023708.pdfIn PDF document text
    • https://tuwavufubuxa.weebly.com/uploads/1/3/3/9/133997694/9489322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_60338a0b64684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428078/normal_60307a2eac8ac.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/gewisetug/60847385791.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/gym_disclaimer_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/2015_chevrolet_ss_manual_transmission.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/13502078348.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/teams_that_thrive.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/14661353658.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001821a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1821A 27840 bytes
SHA-256: b2e09f5ca88080bddf38e53f9fe19ce09922c4f23a91aa2f6b500e44877cc84b
font_00_sfnt_off00014931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14931 5364 bytes
SHA-256: 1f1b8e36c49e1e0f3b5deb1a2a037851701220000337a1fc335dc89472dba56d
font_01_sfnt_off00015b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B79 11288 bytes
SHA-256: 99bcef52a08a65eca72ea0f5e71d68b5933a3adf19fc0b1bfe261bb908404a5e

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