Malicious PDF — malware analysis report

Static analysis result for SHA-256 feaae4638c63fc91…

MALICIOUS

PDF

80.3 KB Created: 2021-03-16 07:13:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 15f99cafbfa30dd0ccc12f35b9b81155 SHA-1: 62907591fa325a8bc41a34e51ff2660ca80cd123 SHA-256: feaae4638c63fc91add6d623d4350724030111d1f832efdc570ad5cee9fccc0c
126 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a disposable hosting service, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://maypoin.ru/wix?keyword=inequalities+in+two+triangles+worksheet+pdf PDF link annotation
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/4473820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_600aba77afa76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500889/normal_5fdc457bae486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408706/normal_6018677176938.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/papiromiwafijen_xanepupixuw_batafo.pdfIn PDF document text
    • https://sudiduku.weebly.com/uploads/1/3/1/4/131452825/68004d344d87.pdfIn PDF document text
    • https://bejetatibuket.weebly.com/uploads/1/3/5/9/135957672/dikapi.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosudav/8Cjggf5/sulobofuwetinorawupuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/bkjjz2l/gisufisigito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fd625ddd5903.pdfIn PDF document text
    • https://cdn.sqhk.co/vabolepibe/CWieEjj/31791675389.pdfIn PDF document text
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/borapusovije_fupamonobanaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/95a4d668-2c03-41b8-a755-1c3546a52ddd/falodexuloxejawubakumor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69cd60a8-bbad-4982-9e34-d52d3ebb6766/what_is_screening_method.pdfIn PDF document text
    • http://nabunuwo.epizy.com/22881204300.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/jasonunivupeke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf76b34-d683-4eec-af3b-de1d7769f8ba/chick_fil_a_processed_food.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/livro_liberalismo_e_democracia.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/i_am_thankful_for_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/590f9cec-1fd9-4af8-97b8-4a4792dfeed6/how_can_i_record_music_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a450db-8a9e-4039-a713-9b6d3194ee77/criminal_law_cases_examples_uk.pdfIn PDF document text
    • http://vapufebifuv.epizy.com/basel_iii_final_rule.pdfIn PDF document text
    • http://bedozep.rf.gd/shadowrun_6th_world_character_creation.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC966 7240 bytes
SHA-256: 80eb978b0e8d1252d93593055a0ba371fb469057fc92075e3a1df60a506dc0de
font_01_sfnt_off0000dc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC22 5404 bytes
SHA-256: daf5edf2c50eb54b14e14d4d559689d6bb2939c59ac5c146e00f6c31230ae7ed
font_02_sfnt_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 9300 bytes
SHA-256: c289eb50e7ae2d60e75257acc577d3ac17e84552fe090e611d3a653c0a3a0a59
font_03_sfnt_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 16192 bytes
SHA-256: 9695cce628265d98fe19231c89d6261270092a6237be2caed840ef37b28e60e4
font_04_sfnt_off000123e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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