Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ae9987f6472dcd…

MALICIOUS

PDF

120.5 KB Created: 2021-03-14 14:28:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 23fbb387bae44daedc232045021b5207 SHA-1: 0765a2333590d5f4776624e8178df245ad1be6da SHA-256: 50ae9987f6472dcd6fc97d5817ca4081e96170a5b932b50268ba7034de0cbb1e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious content.

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://resalured.ru/award?keyword=types+of+antonymy+pdf PDF link annotation
    • https://cdn.sqhk.co/wajerewuwer/Q9inijl/tiremamejevemikizexi.pdfIn PDF document text
    • https://cdn.sqhk.co/pegatorapo/jjdXThd/63088783216.pdfIn PDF document text
    • https://cdn.sqhk.co/kivutuzo/JvjdhiT/58513397995.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/zafirawit/centrifugal_pump_applications.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_f27b4fb22af84c1ca750f6843e71d3fe.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_e32f4abfd4f8445c9821bac3db10dd14.pdf?index=trueIn PDF document text
    • https://b595a6f9-6bcb-48d8-acfc-7cb8c696cf55.filesusr.com/ugd/21f311_24cc4cc01b1e4ce7b7769e673b0be0c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/1296373141.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_cc6a7e68d2c34887893f600354124aca.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_aa343f99c3ec4252abd68b96c9e89c89.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_7518bc82d8b94e75bbf36247c227f416.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_abc1d2ccc5fb4d43ab20c035d0bebb17.pdf?index=trueIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_07e3e65629c1477c9da88e52f5835407.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/kirupuvoxitiwipakugat.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/36462986996.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/fodors_guide_costa_rica.pdfIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_384ccfd939d34a5f97026a9850fb6bf9.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_a4284121067f427cae229c98cea8850c.pdf?index=trueIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_d640e9e358ae45b4b6521a420435f439.pdf?index=trueIn 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_off00019c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C6E 5108 bytes
SHA-256: 7d8c3f354fe8f885214d5801870d2c9669e4bed735ce6eac94664f2a62f5c2ea
font_01_sfnt_off0001add1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADD1 11380 bytes
SHA-256: d24c1941b63e06e487ae9e836d4a7c3d3640d9ca9c8c5ba0165a436375f8cf16

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