Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e2b9128d2cb433…

MALICIOUS

PDF

87.7 KB Created: 2021-02-24 06:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 66c114f09e47c3679ea19604fadae0ac SHA-1: f244ce1294fc2aa9d1f508fa61011efca4de5393 SHA-256: d3e2b9128d2cb433102bc90d322515eceeb93b7f5cbd49a2f2723200e90d687c
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs and the nature of the heuristics point towards an attempt to redirect users to potentially malicious sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=is+loneliness+a+psychological+disorder PDF link annotation
    • https://kupifima.weebly.com/uploads/1/3/0/7/130775493/raxupafawikobo_lumofopo.pdfIn PDF document text
    • https://gitexapovaje.weebly.com/uploads/1/3/4/4/134464395/gorula.pdfIn PDF document text
    • https://radunepik.weebly.com/uploads/1/3/4/6/134617153/4400465da.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/TW2oIQF/funny_christmas_shopping_memes.pdfIn PDF document text
    • https://cdn.sqhk.co/ginudaket/ykDigg8/75499364650.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/guQWMWf/parukabipeperovaruxibuw.pdfIn PDF document text
    • http://hook-up.fun/sheldon_axler_linear_algebra_done_rightjs6s1.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/fsRjagj/hachi_hachi_ashdown_arkansas.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/sesijesule/puwos.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_005_off000125d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x125D7 25084 bytes
SHA-256: 84f12a070fe26045003e2e9caa19c9e1051d9793a69f8788a1c889432a52e0b8
font_00_sfnt_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 5376 bytes
SHA-256: 27aeb6fa20bf459bea031d260f0a451f8b1203c61888da57ed8be4aee3bf0ec2
font_01_sfnt_off0001017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 10628 bytes
SHA-256: d4f6298b8abbd17a975d569cdb860ac469a23a6e1a389e24d3547f398ba27073

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