Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef74fc1be701fdc…

MALICIOUS

PDF

109.3 KB Created: 2021-03-15 16:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6d040dfc542a4d7a2a0b13d03ed40021 SHA-1: 21d0e0d628f843469749797436d823b9dce4c2d5 SHA-256: 5ef74fc1be701fdc2727440bf7c463c864887fe3a01f3da5c861665130e5a7ba
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating redirection to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to a dinner party menu, likely to disguise the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=vegetarian+gluten+free+dinner+party+menu In PDF document text
    • http://gejudoxe.mypressonline.com/xepeselavovilovozamitulab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446379/normal_604183be5bdee.pdfIn PDF document text
    • https://daxapiruxibi.weebly.com/uploads/1/3/2/7/132712323/45528036b6dc0b0.pdfIn PDF document text
    • http://wiwajekirutiw.scienceontheweb.net/setomubapoxe.pdfIn PDF document text
    • http://nujokopinud.iblogger.org/35692057811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_603e232cecf2e.pdfIn PDF document text
    • https://mowasedexalobir.weebly.com/uploads/1/3/4/7/134743102/tuvovow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497666/normal_603172069df24.pdfIn PDF document text
    • http://revikusuves.22web.org/fomegomimuwetalak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465125/normal_5fc5f829ad641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_602432a57ba9b.pdfIn PDF document text
    • https://lezanixopedem.weebly.com/uploads/1/3/4/8/134886347/lowobolazigokugizeze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374682/normal_60017ecc4cb7d.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/tobamodanuzojisokuloriro.pdfIn PDF document text
    • https://rikulaseno.weebly.com/uploads/1/3/4/4/134471776/1475888.pdfIn PDF document text
    • https://venivuwaw.weebly.com/uploads/1/3/5/3/135308653/6195930.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450037/normal_5fc572bd8ae61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zugutixe/6381340588.pdfIn PDF document text
    • http://pabovabavuwemet.rf.gd/precalculus_textbook_online_pearson.pdfIn PDF document text
    • http://xizevobawilu.epizy.com/36179249640.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/cydia_jailbreak_ios_10.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/aerobic_workout_music.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/xodamerizobojuwewelexuji.pdfIn PDF document text
    • http://pusebirenox.myartsonline.com/tepugikevekasipitis.pdfIn PDF document text
    • http://zumojuluru.epizy.com/what_does_a_software_support_specialist_do.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/folezisef.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4B 5248 bytes
SHA-256: f1db49a190489d513f7f10e635c4d74ea3f99a76423a6e7c5b58c8f5b93e321f
font_01_sfnt_off00015e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1D 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000166aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166AA 12120 bytes
SHA-256: 8e46d491d9166452fa17c2d1dc15207cc37abd2150bb5168b306c633d99d7011
font_03_sfnt_off00018f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F45 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b

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