Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da9ed609bc94fe2…

MALICIOUS

PDF

75.7 KB Created: 2021-02-15 20:23:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ad2fee40d6ca0866554c908bf8947fd2 SHA-1: c8eff6bfff5324df3ded9b405940dc7d9516d15e SHA-256: 5da9ed609bc94fe2ac6d2c8e60af6b979566e0d2ee574bbf98e2568e5032fb15
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the presence of external links points towards a potential phishing or SEO spam campaign, 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/wix?keyword=the+wolves+sarah+delappe+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451376/normal_5ff07b982687b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452392/normal_5ff9c94515815.pdfIn PDF document text
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/5238642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401714/normal_5fe061c7ba411.pdfIn PDF document text
    • http://docita.fun/notary_acknowledgement_form_new_yorkow3jj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_600d1fdc9c778.pdfIn PDF document text
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/5505789.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485310/normal_5ff94d94484ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465145/normal_5ffae2d4c3e04.pdfIn PDF document text
    • http://dalkomis.website/jimixipejorusovo539a3.pdfIn PDF document text
    • http://callipakk2.site/dino_world_jurassic_dinosaur_game_hack4cnq6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446634/normal_6004c59caf6a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449992/normal_6011ed627aa92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489255/normal_5fe12828804bc.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/7798a7f7.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/jemazejodep/langrisser_mobile_soldier_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/la_viela_costa_gold_chapei.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/display_grid_template_columns.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_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 5232 bytes
SHA-256: fa76eb0f2c4f0430ae48284d9f57ef0be896697082bf24feab766bb8e603813c
font_01_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 10448 bytes
SHA-256: 3913917d6473a580ba0e5b4db728d3f9f720da6da5712f4c4ea3e70563acb927

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