Malicious PDF — malware analysis report

Static analysis result for SHA-256 993b4719e4c11e0a…

MALICIOUS

PDF

77.0 KB Created: 2021-04-30 01:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4b0cd8c8d950afa6ca496842669e5383 SHA-1: ef32d314a67f65fd8240196f95f3ffcf5a184975 SHA-256: 993b4719e4c11e0a3901fd579bcc4d743d018f01012ab9080693c7229ef2583a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing indicating a link farm with numerous external links, suggesting a phishing or malicious redirection attempt. The document body, though heavily obfuscated, contains a title that appears to be a lure. The presence of multiple unknown URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=is+the+mule+based+on+s+true+story PDF link annotation
    • http://hookup671.site/ramuxaposukopufiwet45w8.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/kirefaxi.pdfIn PDF document text
    • http://francobusiness.com/cisco_ise_2._2_hardware_installation_guidez4qht.pdfIn PDF document text
    • http://bionatur.space/xbox_one_controller_will_not_connect_to_pc_via_bluetoothxxbqk.pdfIn PDF document text
    • http://options.expert/gigopatabijipijinizusuleecqn.pdfIn PDF document text
    • http://gufutaca5.xyz/vuvomafoxopuwawolakoxa60g.pdfIn PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/42719de1f59db97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_a5b4902cdead4bba90052a9c8f5a0c6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/hypertherm_65_vs_85.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_170654273a4648deaaaddc213965391d.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_d4b8bfd1f302457cb1344614e7d9ba90.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/how_to_remove_footer_in_excel_sheet.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_e418dad5a3584217ad467e940b45a3a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/63649864554.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/20851391336.pdfIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_203fe923f06041fe9a6742c1dd686c75.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewibim/malnutrisi_adalah.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_5a57bb4138874d6fb46be813156eb3a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julaxel/87647509437.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/macbook_pro_2011_ssd_upgrade_guide.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_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 5244 bytes
SHA-256: e4edd4a6ebf2ac0c1f498018e9831a6f73d4ba897392540c86514e48689c80a1
font_01_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 11028 bytes
SHA-256: 8a241d40a4432199bb5b6dc061f7495b2073ff1ad2507748ccfe73177467f08e

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