Malicious PDF — malware analysis report

Static analysis result for SHA-256 722a661865aa0a98…

MALICIOUS

PDF

80.3 KB Created: 2021-03-25 13:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77d1d288c1b2e0f54e4b6afe3652f663 SHA-1: 112f26188901ea5046a2cac0131927ab78712fa5 SHA-256: 722a661865aa0a9874868e073d4b3726c77d50b8e57c8480bf5b3964f40681d5
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine rankings or direct users to potentially malicious content. One of the embedded URLs, 'https://soxebez.ru/wix?keyword=we+are+many+pablo+neruda+analysis', is flagged as unknown reputation, indicating a potential risk. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/wix?keyword=we+are+many+pablo+neruda+analysis
    • http://naturebiolog.space/amscope-kids_microscope_kit_instructions05mkw.pdf
    • http://boldly-grow.com/43776593567mig0p.pdf
    • http://xagowawusik.66ghz.com/rofuvilimatibafusevuj.pdf
    • http://zexinebizo.22web.org/video_chewing_gum_nct_dream.pdf
    • http://kyrgyztours.com/86875630169qzod8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/legenapi/65442614885.pdf
    • https://uploads.strikinglycdn.com/files/3881e62f-282c-4ad3-8c75-ac20cf6c3d25/how_to_get_a_month_to_month_lease.pdf
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_6e07bd21261c4d5f864c9e70ed1c4451.pdf?index=true
    • https://s3.amazonaws.com/nisiwanolom/gekenejorukoxo.pdf
    • https://s3.amazonaws.com/xalexojaxipud/xugijinupij.pdf
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_fcc0003573cb4804a7c19dc7ac8d21f4.pdf?index=true
    • http://gizamir.epizy.com/time_calculator_pc.pdf
    • https://uploads.strikinglycdn.com/files/3785d5c9-b7ab-49fb-b579-14a220cbad1c/learn_spanish_books_for_beginners.pdf
    • https://s3.amazonaws.com/likerajatob/40464368911.pdf
    • http://marakolin.epizy.com/temefobuzelekuxogitid.pdf
    • https://s3.amazonaws.com/woxotopapozokev/75813788150.pdf
    • https://s3.amazonaws.com/xufaxoferugod/73302139495.pdf
    • https://s3.amazonaws.com/kawotexulozax/rheumatic_heart_disease_diagnosis.pdf
    • https://uploads.strikinglycdn.com/files/3842d9ef-e69b-4a9c-a89f-beeb3461f27f/konosuba_volume_17_summary.pdf
    • https://s3.amazonaws.com/rawesaragegugar/wexaniwagaxufupuxoton.pdf
    • http://zusuxib.rf.gd/what_is_deterrence_cold_war.pdf
    • https://s3.amazonaws.com/sorapobuk/lure_fishing_for_wels_catfish.pdf
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede0.bin
cf252994c3989eddea42bf79d1ece59ac536610cea8fa0a0235c6d8a4d0a61f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 5160 bytes
font_01_sfnt_off0000ff4c.bin
ad30be43b7dfd2380746952d69ec95f48238531caa2dcb8910bef2cf3a30b2c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 10828 bytes
font_02_sfnt_off000123fb.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 4324 bytes

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