Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0138e40d45ce836…

MALICIOUS

PDF

78.5 KB Created: 2021-04-17 03:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bdfe19341b36030b0dffc044631818d1 SHA-1: 85cc6e5bfe21dbccc49ade3b6b20cab82730eb47 SHA-256: d0138e40d45ce8364efa870c4dd17092762fab44de467a7193b09a46e1926c5a
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, including one with a suspicious domain (resalured.ru). The presence of embedded URLs and the overall structure suggest an attempt to redirect users, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=technivorm+moccamaster+parts+canada PDF link annotation
    • https://ratesikumetu.weebly.com/uploads/1/3/1/1/131163578/cc6fe.pdfIn PDF document text
    • https://kibinopojisetux.weebly.com/uploads/1/3/4/6/134662243/318d3c2.pdfIn PDF document text
    • http://nakanilo.club/us_postal_service_international_mail_forwarding3yukk.pdfIn PDF document text
    • http://wacc-cat.org/biologa_celular_y_molecular_harvey_lodishek7qp.pdfIn PDF document text
    • http://kinoxca.xyz/blockbuster_song_naa_songsmjhvh.pdfIn PDF document text
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/tufitumafug.pdfIn PDF document text
    • http://streamsweets.com/internal_auditor_course_freebf96c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_5499f2b30c1944319ce6febb3d158d5b.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_0864e4cd31834577bae3fc1fedf5bd6f.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_8b4775d4d6d2438ab3d1d6bae487a70f.pdf?index=trueIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_1405f6b84c394534ac0f6474db0102ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f34b88-2947-45ac-8828-23cb4365116f/can_you_cook_kidney_beans_in_a_pressure_cooker.pdfIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_e299f56c2c204bd4abc2d96557e86626.pdf?index=trueIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_e18947916c99435a900480ee168f7312.pdf?index=trueIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_93dc97b9d1d64706b27b18eeba673cdc.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_aa2b8fe90a6d4c8e941fa211e2f90207.pdf?index=trueIn PDF document text
    • https://eb22cd64-ba88-4d74-9269-d2b8937e52af.filesusr.com/ugd/3b217d_29e34d3f61db43a2b58d6ae9a8319f64.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_c38152de13e5463296826c5d103350b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/080ebe73-deda-46c9-8702-94c9c13af345/75158514842.pdfIn PDF document text
    • https://1b3e2d6a-0348-4772-9bb2-16e56a761455.filesusr.com/ugd/7bcf02_0179302e5a0946119da085840e948261.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_c5a0735c0a264f089aadddfde7042e3a.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_0e47ec43280649e295bb5c217720442e.pdf?index=trueIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_e180325b1aec4ca8a993370a66f8a560.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_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 5288 bytes
SHA-256: 11f5a25ba7c2e102732c258a08f2e54d27442cb13b6a5e1f413d3cfdd99a3731
font_01_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 11568 bytes
SHA-256: 37db673fb4784357e1a6fcf377fd5b82f71b20ab039501386c094798032e2d84