Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d830556dce14bf8…

MALICIOUS

PDF

39.3 KB Created: 2020-11-06 11:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0ed5d1c87edb8e89a09082409c1eeb6f SHA-1: dadb3a43f26239c6b31f3a4dcaaa17a13b8319a2 SHA-256: 0d830556dce14bf840ac25ef0ed668097c8404b1ffe481af03d4870b88aeb713
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffnew.ru/123?keyword=psych+2020+tv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f892a00c1291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f8712423f973.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0268/9377/9129/files/whiskey_ice_cubes_stones.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/universal_theme_of_daedalus_and_icarus.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/b._sc_nursing_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/53652176636.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/ms_excel_2007_advanced_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/3154/8849/files/maiya_yashoda_tera.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/29850722977.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/sanasikezuwawaxib.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/xanupusimajufuxagalote.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/mortal_kombat_2_player_games_online_free_play.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/xumikifoza.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F80 4392 bytes
SHA-256: bca37aab6008ce7e29056444627c9465baa3b3e90c2bd4c8484bfc93afa48213
font_01_sfnt_off00005e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E75 10632 bytes
SHA-256: 453e696cd0671376f7e0c2863150e36818637eca25a98f43c3c41a67db3494d9
font_02_sfnt_off000082de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82DE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3