Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afeb6014b9b0dfb…

MALICIOUS

PDF

74.5 KB Created: 2021-02-04 07:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 033cb60a1a3876c612a732ae08c537d9 SHA-1: 3caf1c250b1d4028db3935550b91dd45da2c274b SHA-256: 4afeb6014b9b0dfb3d60a3001cc70daab40599f197244603b72e6de68a004e14
184 Risk Score

Malware Insights

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

The file is a malicious PDF, as indicated by critical heuristics and ML classification. It contains numerous embedded URLs, many of which point to disposable hosting and redirector infrastructure, suggesting a phishing or malware distribution scheme. The presence of a malicious redirector link further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/aws?utm_term=broadsheet+size+indesign In PDF document text
    • http://asia.kiwi/pixel_car_racer_hack_ios_no_human_verificationdm63s.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/novurenupeforubamavorelbmcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5fd5f592e7b33.pdfIn PDF document text
    • http://zirekafeti.iblogger.org/zoratopovoxud.pdfIn PDF document text
    • http://mritzoliver.design/basic_tactics_for_listening_3rd_editiew8v.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/gfKjiig/jolovem.pdfIn PDF document text
    • http://waystep.site/3114005955tj0o8.pdfIn PDF document text
    • http://rmk4sale.xyz/isabel_allende_libro_paula4yysd.pdfIn PDF document text
    • https://cdn.sqhk.co/sadisadaz/ydQjjgh/small_origami_heart_3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452398/normal_5fc815301fcd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_601a296cb38b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_600f0f561f1d1.pdfIn PDF document text
    • http://medugogubi.22web.org/kozuzutugagebogoset.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383449/normal_60079ad7d0af4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376629/normal_5fcf85b4c326f.pdfIn PDF document text
    • http://blekrossi.ru/8980627054218xfw.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/giT1Sif/diy_soap_cutter_plans.pdfIn PDF document text
    • http://itdiscount.info/78481812220ellch.pdfIn PDF document text
    • https://cdn.sqhk.co/poxirowo/AQehilo/how_to_decorate_a_cake_with_powdered_sugar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lupugavediroz.rf.gd/fuvuxunogumowatevonoge.pdfIn PDF document text
    • http://nukamepewavux.epizy.com/jobavoripugumufafukuna.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 5152 bytes
SHA-256: b60f0d5b9ba05e7c1a888232cde7880ed134a7b2d304abbd79845198caff305b
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 10516 bytes
SHA-256: d83b5f17bd7bd1f8fc28604c7fb0d6fbd9a6ff43f7abd01667486073b364663c

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