Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caa1153d37bf306…

MALICIOUS

PDF

79.2 KB Created: 2021-04-03 15:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 45d17cc2e44743ec257e4878923598c2 SHA-1: 4c1c68659a091ef453a935a2a1270d1d357a602b SHA-256: 1caa1153d37bf3066536ea43b9ed206e9bba5527340f770a5fb6dd1d78a8741e
156 Risk Score

Malware Insights

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

The PDF contains a high number of external links, with one prominent URL pointing to a suspicious domain ('druttle.ru') that is likely used for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

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/strik?utm_term=williams+legato+88-key+digital+piano+headphone+jack PDF link annotation
    • https://cdn.sqhk.co/barugogip/iiKZHUj/jutadejekasuke.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/fgihhCe/82537538767.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/cdifjaT/best_secret_video_recorder_for_iphone.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://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_91961aa22c8448cdb0e074ab5f574c53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/60334642457.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_36584dd9e9eb47b198ea0f587e543203.pdf?index=trueIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_f0a0a2f2c0c847f6af41795393398ec7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/google_assistant_api_android_example.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/zaxediraxakiguvafeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9612db-d4c8-4885-8a4d-5a1b57b598b0/faturibi.pdfIn PDF document text
    • https://9ffa65b4-b95e-481c-977d-2cf6acaa57d7.filesusr.com/ugd/f68d46_d238996232ba4cc5a7fe6e4727d304f1.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_347579a048274d47bddef991ffb42efd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/poxerawutirakuronep.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/how_to_install_uppababy_mesa_without_base.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b5b929-f7cc-4ce2-a0b7-44bbe9cb5e1b/76446265041.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/joraboladewerom.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/amazon_appstore_fire_tv_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67fdd32b-a0f8-4f6f-a145-4ce613551477/tetalefiko.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_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 5660 bytes
SHA-256: 3177b46191f387e4bdf5de706ea24b68ac1fda211bbdda72fff4283c20937d87
font_01_sfnt_off0000fcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 10648 bytes
SHA-256: 1a370c3a8643101c361a67114018b508f2b47bd24e02dc973a9712b7b18ad792
font_02_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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