Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cd303eb0a87ed8…

MALICIOUS

PDF

79.7 KB Created: 2021-03-30 08:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09a218bda4cf07f9cf19607897f4e855 SHA-1: 795f32d16e1d61da86e8ade8ab26c25f6d7ebbfd SHA-256: 83cd303eb0a87ed859b57d44c9b01ae7da1a945e00f1e9f262470a63cad8d613
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or designed to redirect users to malicious sites. The primary malicious URL identified is https://kuzutuzo.ru/strik. The document body, though heavily obfuscated, appears to contain keywords related to appliance troubleshooting, likely a lure to encourage clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=samsung+rf26hfendsr%252Faa+ice+maker+not+working
    • http://xariketixagat.mypressonline.com/niv_zondervan_study_bible_premium_leather.pdf
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5fe0b62e45f5e.pdf
    • https://manabuvajej.weebly.com/uploads/1/3/4/8/134847277/fewowanalufemepuxev.pdf
    • http://teachost.com/seperiporixelosexiaipyb.pdf
    • http://gifinibufenatar.medianewsonline.com/how_effective_is_the_covid_vaccine_cdc.pdf
    • https://lolejubabam.weebly.com/uploads/1/3/1/3/131379737/4475577.pdf
    • http://proflist-barnaul.ru/21580784751q5rq6.pdf
    • https://gononazenikemad.weebly.com/uploads/1/3/4/4/134482012/gomifovel_nejajege.pdf
    • http://hhizmet.com/wamuwadumidmw140.pdf
    • http://yesitalia.fun/24172261099idabs.pdf
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/fekasujavesaxugejoju.pdf
    • https://static.s123-cdn-static.com/uploads/4410416/normal_5ffa9e22b891b.pdf
    • https://gepobuxew.weebly.com/uploads/1/3/1/0/131070920/7416666.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_7475d60f2250489f9e5be6cae05aa574.pdf?index=true
    • https://s3.amazonaws.com/bifadiwuwileji/2019_afl_fixture_finals.pdf
    • https://s3.amazonaws.com/gofiguj/vizio_sound_bar_manual_tvol.pdf
    • https://s3.amazonaws.com/nitatotol/android_10_battery_drain_oneplus.pdf
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_21f146db74fe40bc8317ff6b417bca24.pdf?index=true
    • https://s3.amazonaws.com/zikeko/up_pixar_english_subtitles_free.pdf
    • https://s3.amazonaws.com/lazolu/gelatibikikiwul.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f744.bin
dbc3e4a48aaca77d7a095698e527535b3e2e60f62b7451df89c12e10ebca43ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 5984 bytes
font_01_sfnt_off00010b93.bin
9ec8cdd9049855289aba6257fd49c855be1b0e1de2c6836dda5c63d9d36fdefc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 11088 bytes

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