Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac86d8fa1b434e7…

MALICIOUS

PDF

99.2 KB Created: 2021-04-06 12:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8810649022e951de436472727f20131d SHA-1: d2dfc24b9fdb31c025f8d1fcde5ae41e567339d5 SHA-256: 8ac86d8fa1b434e748f4cc24b94d9cceb9545a294df8d0e4a879752e6067d7da
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://fokemale.ru/wix?keyword=nest+thermostat+gen+3+owners+manual', appears to be a lure for potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/wix?keyword=nest+thermostat+gen+3+owners+manual PDF link annotation
    • https://cdn.sqhk.co/bedepekemat/JrnXiju/jigutujugezevepape.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/JgejioD/kik_application_download.pdfIn PDF document text
    • https://pupiwukonavi.weebly.com/uploads/1/3/2/6/132682553/3b6ea6f9538.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/propiedades_mecnicas_de_los_materiales_librosomu6i.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/5062485.pdfIn PDF document text
    • https://pejagefetem.weebly.com/uploads/1/3/0/8/130815482/ecf3b07ea4d6e6.pdfIn PDF document text
    • https://cdn.sqhk.co/fosapuzisas/XxicOJT/bigeminismo_ventricular_tratamento.pdfIn PDF document text
    • http://auth02mobility.com/plato_theory_of_justice_in_hindiq450q.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_58b6feafdd56414eae2ccef495fff67b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/benzoin_to_benzil_lab_report.pdfIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_433f33ad7cb842a68eea495f831240e8.pdf?index=trueIn PDF document text
    • https://f8206d31-21c4-4aef-9da9-e4259ded718a.filesusr.com/ugd/c2bdac_70fa28d6d7cf4cc08b407095ad9f44e6.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_616f8ab2254c45f4a317afc1ce2fc751.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_a20b9836e0ad45cc87a4a2f25741b77b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/dojuxomipemazu.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_78e756a68a47414886242e62692aea85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mipizaju/mopoku.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/critical_thinking_movie_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/hari_arora_applied_mathematics_3.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6F 5324 bytes
SHA-256: 588785900b18d9b17e7829055a91ec32e58c99242b6d895f136eef86106f2658
font_01_sfnt_off00013e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E75 13204 bytes
SHA-256: 5cad36f51161e74909de8b93a0aff858d8539f8303d4235bd302bbec619e4e2d
font_02_sfnt_off000169a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A6 16232 bytes
SHA-256: 90063111fd84fc9d3bbe0e91a25c30074b178549c4c86487e0bfae44fa44017a