Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf20a1e8bce36be…

MALICIOUS

PDF

81.7 KB Created: 2021-01-06 22:07:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: af0483cc4d23c2a14f2d234b51128448 SHA-1: 7569610733768e21e5c2b028fb63b5d75e1e3442 SHA-256: dbf20a1e8bce36be0bd41170f1101c00ef719ecfa15006df3ab61f920d4ddf82
164 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for containing a mass external PDF link farm, with numerous URLs pointing to potentially malicious content. The ML classifier also assigned a high probability of maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect the user to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/aws?utm_term=lspdfr+callouts+v PDF link annotation
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/454ede61a.pdfIn PDF document text
    • https://cdn.sqhk.co/tadanopi/jhlpDgd/moist_chocolate_cake_recipe_easy_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/uhbjaGk/29643506138.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/5124055.pdfIn PDF document text
    • https://rusopuse.weebly.com/uploads/1/3/4/4/134498446/fagodemuro.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/fefoxolulota.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/hg72gev/kafijinur.pdfIn PDF document text
    • https://cdn.sqhk.co/linerutinew/RGvuDiY/kesovuxewame.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/jjbjhgf/ninja_air_fryer_recipes_baked_potato.pdfIn PDF document text
    • https://gefojepedawe.weebly.com/uploads/1/3/4/4/134478994/cb74da77c0.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/goneduzum/wash_basin_images.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/square_receipt_lookup_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/baking_sheet_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/91672588219.pdfIn PDF document text
    • https://discord.gg/RfusWg9In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 5148 bytes
SHA-256: 2191e63d4fd317551a896af6979071eb7788a74e1f47db0c29ae75892340e016
font_01_sfnt_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 11328 bytes
SHA-256: 386777ac622f630bf603a650d28d28de87c99724d8a0dcd4e7189a31cec9d6a8
font_02_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 16168 bytes
SHA-256: 0216150ac0e5ade23b072752459620ec704bdac01526bfbadd96d51f96873ef3

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