Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a8c375665d4a1b…

MALICIOUS

PDF

84.4 KB Created: 2021-03-15 05:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dde1e7a2584d46ae5bae21b5dd1388a5 SHA-1: 2339f6a8607c221a3122da9f173b4c84d1c35c65 SHA-256: 40a8c375665d4a1bb72823cf98a83c259aecb68a3c20ded91851d394050d8861
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, including a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to patterns, which is likely a lure to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dugedepap.ru/wix?keyword=male+tunic+pattern PDF link annotation
    • http://azakalaza5.xyz/zuvakomowijeykcg2.pdfIn PDF document text
    • http://ketousa.site/lunegexugedajugizipigugac1z6.pdfIn PDF document text
    • http://gugolufixa.mywebcommunity.org/zimuzugamifu.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/awareness_anthony_de_mello_download.pdfIn PDF document text
    • http://duvejiwuxikon.getenjoyment.net/pewenubix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458849/normal_5fd991cb3873a.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/nijolii00ss.pdfIn PDF document text
    • http://wuwisometojone.66ghz.com/62904058803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379731/normal_601dad461a4da.pdfIn PDF document text
    • http://about-central.com/repuvefupetilonabumodexye1pi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387567/normal_600918a2ba3b1.pdfIn PDF document text
    • http://keruxiwu.22web.org/libro_geometria_analitica_charles_h_lehmann.pdfIn PDF document text
    • http://xesabuzusoneb.66ghz.com/55381744937.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wefusav.rf.gd/rival_18_quart_roaster_oven_replacement_handle.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_b8e7e369a5a048e38af910410a87baf7.pdf?index=trueIn PDF document text
    • http://garulolit.rf.gd/free_club_flyer_template.pdfIn PDF document text
    • http://relivoziz.atwebpages.com/tork_e101b_timer_instructions.pdfIn PDF document text
    • http://bufopalepigugu.epizy.com/82216098425.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_b59621e299894865b9f147229935b687.pdf?index=trueIn PDF document text
    • http://wetoxisifogif.epizy.com/67986742547.pdfIn PDF document text
    • http://pukafenofi.epizy.com/excel_sheet_to_keep_track_of_spending.pdfIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_8b1338f63d074519a73131c3f5ea95c6.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_9d369720bfed409997d577f86bdec71f.pdf?index=trueIn PDF document text
    • http://gobavaduxa.epizy.com/lodavunifafibomob.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/prepositions_of_place_exercises_pre_intermediate.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 4752 bytes
SHA-256: befcb12abdeb9eb4a1e1a7355954862bdbf17f9df525d98646c5a58655fbf5bf
font_01_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 10864 bytes
SHA-256: 6a12e99edd3913c7ea6c7d7ed920f791ee75f87d2217c2ab490785af6b0151fb
font_02_sfnt_off00012ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE9 16068 bytes
SHA-256: 11273ae8fae1fdd6f1ef685405aa24809e8907aa8ff7c84b2d15fc4bedf4a7f9