Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8669503938fb193…

MALICIOUS

PDF

78.4 KB Created: 2021-04-02 03:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcde9323fb91e329da54a94b110f0a69 SHA-1: a10b4381c75be793e5a25ae976889dc131f20979 SHA-256: a8669503938fb193379757356ba229c76ec06a383676e7899366f7b6b24d62e4
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, indicating a link farm or a method to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/wix?keyword=on+the+sidewalk+bleeding+answer+key
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/296f41567fd3d6.pdf
    • http://yildirimotobursa.com/sinuripozetapojatugadou8wwz.pdf
    • https://ritajixudigozik.weebly.com/uploads/1/3/5/3/135345652/a91e5.pdf
    • https://cdn-cms.f-static.net/uploads/4463010/normal_6053214773cdc.pdf
    • http://natnat.fun/the_hunger_games_catching_fire_movie_download_in_hindi_480p97fyh.pdf
    • https://zizopozuwugova.weebly.com/uploads/1/3/0/7/130775786/489637.pdf
    • http://winfreeiphone.xyz/michel_de_montaigne_essais_de_la_solitude_analyseh03oz.pdf
    • https://gatamerat.weebly.com/uploads/1/3/4/0/134000446/064f7ee99f51485.pdf
    • http://help-service-support.com/jolerevojegofigei37.pdf
    • http://rejojonomupe.iblogger.org/lepix.pdf
    • http://datulosuwila.iblogger.org/autocad_crack_keygen.pdf
    • http://xamakag.iblogger.org/xiwumidogelava.pdf
    • http://www-sfr-fr-monespace.com/chamberlain_whisper_drive_plus_reset_codemy1le.pdf
    • https://static.s123-cdn-static.com/uploads/4380527/normal_5ff97c8cac01d.pdf
    • https://cdn-cms.f-static.net/uploads/4413000/normal_602c7d9181d20.pdf
    • https://zegazofegu.weebly.com/uploads/1/3/5/2/135296009/lurafenalomum_tujuso_girobasidotu_rubanatofenit.pdf
    • http://rizaloripejo.iblogger.org/contexto_social_y_politico_de_la_dictadura_militar_argentina.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_b93c481983c54140bbdd80510b6a6bf5.pdf?index=true
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_ddea7b3d7ea34d2aa6f620e1fda0e401.pdf?index=true
    • https://7abbf572-6989-4614-8246-9d5ba34cd238.filesusr.com/ugd/af841b_303cb3629f784309a8c1e4cfdc6ed8cb.pdf?index=true
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_6e431c8c75c94a3f96201a07d4e8693d.pdf?index=true
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_0518ac4b54a1451b99beedfe4fd27b5a.pdf?index=true
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_a725fd761a0b4fa48ee3313483c42750.pdf?index=true
    • https://04fc2a56-3ca8-4b90-bfe8-b05f9e7ed3d8.filesusr.com/ugd/51e9d0_b45eaa218ff64f0dbf4f94b2992b2612.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33c.bin
b88c20a195d5b912828be64858630420693c070316eecda403a62fdbd16639c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 5512 bytes
font_01_sfnt_off00010603.bin
2790250af9df5cfc6fd9afa3af3823ce3a6eb7f8d4854b1cdfb000ba1b0a8541		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 11104 bytes

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