Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f2d55380cd503e…

MALICIOUS

PDF

78.2 KB Created: 2021-03-31 20:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de106c22bcaef0f3c7ba67e98d1ceb39 SHA-1: 637bb4a2807c83c348f85b478cc678b2fb283185 SHA-256: 44f2d55380cd503eb58bbbf3353d21cd0810f257a3db9710cb94d6441558aae4
126 Risk Score

Malware Insights

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

The sample is a PDF file that contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/strik?utm_term=the+feeling+of+what+happens+pdf
    • http://help-copyrighteamservice.com/dragon_quest_11_sunny_citrinevicq7.pdf
    • http://trackcreditscore.info/the_pit_and_the_pendulum_movie_ploto7jkh.pdf
    • https://livaruzurakit.weebly.com/uploads/1/3/4/4/134432061/xabinep_baloganifoseta.pdf
    • https://cdn-cms.f-static.net/uploads/4480895/normal_602b69e78c365.pdf
    • http://zarumesa.mypressonline.com/34611500395.pdf
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/nibigujojaxeguwajere.pdf
    • https://static.s123-cdn-static.com/uploads/4489264/normal_5ff805268cef3.pdf
    • https://cdn-cms.f-static.net/uploads/4383704/normal_6046a8bb1d058.pdf
    • http://copyright-central-media.com/628053992723h5ix.pdf
    • https://derovidexaw.weebly.com/uploads/1/3/1/3/131382126/5240816.pdf
    • http://keepxufi.space/best_emotional_intelligence_books_for_toddlerskszm2.pdf
    • https://cdn-cms.f-static.net/uploads/4371004/normal_60140c5681f6c.pdf
    • http://juraxoxodas.scienceontheweb.net/noun_pronoun_adjective_verb_adverb.pdf
    • http://idealica-ufficiale.site/the_walking_dead_s05e03_vodlockerc335o.pdf
    • http://vegofejolafud.mygamesonline.org/basic_physics_of_atoms_and_molecules_fano.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xamibebulosaxug/grattan_institute_report_naplan.pdf
    • http://diwavubodinaroj.myartsonline.com/46147526475.pdf
    • https://uploads.strikinglycdn.com/files/0f1a3799-1c69-45a5-87c7-626ffdb6199d/28854983704.pdf
    • https://uploads.strikinglycdn.com/files/54af0c90-f2b7-470f-bb6f-9834dc0ee482/how_to_make_a_daisy_flower_with_paper.pdf
    • http://tanonarimunal.myartsonline.com/pukisi.pdf
    • https://uploads.strikinglycdn.com/files/a9265385-e325-4351-a3b1-2b6bd047e904/totugifetisodag.pdf
    • https://s3.amazonaws.com/mogedozara/39516095062.pdf
    • https://uploads.strikinglycdn.com/files/20598140-fd5d-47aa-8f4a-d8e63734decc/how_poor_is_north_korea.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_off0000f49a.bin
74d984f308e6e732ec65c2556aaa18781bcf1869629931fc8665a1f5241bf296		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 5248 bytes
font_01_sfnt_off0001068c.bin
dd850ab916b5d45c8b99fe38f07188d799466fa8dd14d52504295d3266b8d6e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 10856 bytes

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