Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddd481cd51ad73a…

MALICIOUS

PDF

80.9 KB Created: 2021-04-02 04:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9e310b5c8af5053944093c11f352208 SHA-1: 806238ca1fd55409f03492bb389f56df4aa5fa7f SHA-256: 7ddd481cd51ad73acc411a1d6af51336ae2058de23a404bfec8d4958d69f25f0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://maypoin.ru/aws?utm_term=crossfit+workout+for+beginners+at+home
    • https://sutogeva.weebly.com/uploads/1/3/0/7/130739298/pazituwiser_bivizonaduk_wetovogu.pdf
    • http://in-step.shop/ti_30x_solar_anleitunglyczx.pdf
    • https://rurajisikite.weebly.com/uploads/1/3/0/8/130813509/6ad17a5a6d3.pdf
    • https://cdn.sqhk.co/ruvonusebex/iQNDM77/the_dictator_south_movie_cast.pdf
    • https://cdn.sqhk.co/jelivapizivo/fGj1hcO/download_baldi_s_basics_classic_pc.pdf
    • https://xosenevofas.weebly.com/uploads/1/3/5/3/135324499/9314773.pdf
    • https://cdn.sqhk.co/pugepavofu/jSkhgia/badofoxufekekanazobulupa.pdf
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/4a659eebbb2aaa.pdf
    • https://cdn.sqhk.co/rivotoxupow/ghhiyji/80630274480.pdf
    • http://mon-cmso.best/unicorn_dress_up_makeup_and_salon_free_gameswr17z.pdf
    • https://cdn.sqhk.co/xuteposidobi/ciengev/pinball_wizard_elton_john_lyrics.pdf
    • https://vutubazedo.weebly.com/uploads/1/3/2/7/132740780/6188951.pdf
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/8552565.pdf
    • https://rinuxusopav.weebly.com/uploads/1/3/4/6/134679155/momibota.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/13baecb9-1692-4d7e-99b1-96ed604b12fc/paluwokamudexadokuzifo.pdf
    • https://uploads.strikinglycdn.com/files/36e2254b-5ce6-435e-95fd-4cd928f54d66/53501142397.pdf
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_d71c1cc8a6474fc28417e2ef0a49bf72.pdf?index=true
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_6cc660789b614f67a780de9ad168bba6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9649f685-525a-45a3-931a-a9014cd6bf49/what_is_your_favourite_leisure_activity_ielts_speaking.pdf
    • https://uploads.strikinglycdn.com/files/07f938a5-ddc0-47b4-9fe8-cf7fbf93d30a/dia_de_la_madre_mexico_2021.pdf
    • https://24976a62-ea59-4ca6-8500-d0bd08f9a094.filesusr.com/ugd/65a075_f2e875e5062045a3b91e7243d512c9e5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/45f735a9-a201-4468-b405-00cbba74c3ef/did_darth_bane_survive.pdf
    • https://d4e9107b-ea7a-46dd-9434-10729a3140ee.filesusr.com/ugd/2e3df4_b2a30b1b55dd4a938af08eb245a9a085.pdf?index=true
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_c06cb69f36bf4a09894714dbfdf4a382.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01d.bin
80ec05c00d613d9839b1e0d3109d1473695e34c47ff18909b1b72e35ca58c3fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 5348 bytes
font_01_sfnt_off00010237.bin
50dddd1ac2bfefb1c49ef09c4827d6abc91cd52700e64bbc6aab10af24d60b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 11020 bytes
font_02_sfnt_off000127c8.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127C8 4324 bytes

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