Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bde369b14f4f3c1…

MALICIOUS

PDF

117.7 KB Created: 2021-03-22 05:07:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6051422870bd5d59d29a3026d47619f0 SHA-1: b0fe229bf1e667609ae237f061798b5e97ee7e68 SHA-256: 3bde369b14f4f3c1cc5463bf9f2eefdcfe5c6b0f95f98ee583da1292330d7fde
156 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, exhibiting characteristics of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with a primary suspicious URL being 'https://druttle.ru/wix?keyword=northeast+natural+resources'. While no scripts were directly extracted, the PDF structure and the nature of the heuristics suggest it's designed to redirect users to potentially harmful content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=northeast+natural+resources
    • http://kazexezawulozij.mypressonline.com/accounting_and_finance.pdf
    • http://fadulifakibul.medianewsonline.com/libro_el_viaje_del_heroe_gratis.pdf
    • http://kepuxom.mypressonline.com/bible_history_old_testament.pdf
    • http://vipadobotisituz.mygamesonline.org/89338131494.pdf
    • http://zevupixikug.mywebcommunity.org/depression_anxiety_stress_test.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_3d1b3a26deed49449e1b920e977602c7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/044ff81e-0aa5-4086-a17b-ffd60ee63d47/87204011148.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/28243842694.pdf
    • https://s3.amazonaws.com/geradi/colorado_secretary_of_state_business_annual_report.pdf
    • https://s3.amazonaws.com/fipijife/5764796662.pdf
    • https://uploads.strikinglycdn.com/files/c8d8af1f-36df-4e90-8f6b-62a8c0cd16a9/how_much_corn_per_acre_to_plant.pdf
    • https://s3.amazonaws.com/benubapopikaj/pobekes.pdf
    • https://uploads.strikinglycdn.com/files/12c1d936-e608-4b94-8047-be4c89f86b17/aposentado_paga_imposto_de_renda_retido_na_fonte.pdf
    • https://uploads.strikinglycdn.com/files/9f1088dc-7d1a-4c28-b08e-b143538d8927/samsung_8000_series_refresh_rate.pdf
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_87392ae4610d43c499b5df53697ac750.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8aa3b97c-c9d6-437e-9c40-f01808deaee4/dajotu.pdf
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_5054d9a6f70a4a5a8d4dcfd2acd417a9.pdf?index=true
    • https://s3.amazonaws.com/rogugagatuf/26810474490.pdf
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_37f2d9516f7d482694ef727461ad7001.pdf?index=true
    • https://uploads.strikinglycdn.com/files/91a9d07f-e4f9-448c-925e-662f158f567a/84773543595.pdf
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_3e74ebb43e0449189498dde85c9e0c9c.pdf?index=true
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_5096c650891047338cb24b98a85bd452.pdf?index=true
    • https://uploads.strikinglycdn.com/files/336d9540-5fe7-4bb2-9bc4-415376797e70/rorobelitufakiwobojuv.pdf
    • https://uploads.strikinglycdn.com/files/b483bac2-befc-4c3f-84bb-3a1e2e76e584/jiresixibo.pdf
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_465ad16b9bbf4a66b068992a8ee0ffed.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001715d.bin
c3051e97b52b10187fc94bf52277a4b19b4879661458d319e45bfb4537bdcbce
pdf-font-stream PDF embedded font (sfnt) at offset 0x1715D 4692 bytes
font_01_sfnt_off00018142.bin
702dc24b0614b6fdb35bc9a1f8c003e74a57a77b1234495c41f6925b701a3c56
pdf-font-stream PDF embedded font (sfnt) at offset 0x18142 10764 bytes
font_02_sfnt_off0001a612.bin
2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A612 16060 bytes
font_03_sfnt_off0001baa9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAA9 4324 bytes