Malicious PDF — malware analysis report

Static analysis result for SHA-256 d944874f03b446af…

MALICIOUS

PDF

81.8 KB Created: 2021-03-09 22:05:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0112895542b58cca50ad7099df7eab29 SHA-1: 86c37259cbe9a1578e356ba16c93900efb7c1c5f SHA-256: d944874f03b446af83a5c9090f292d8dfc5d5e71f0e250f63228a96517635eae
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest an attempt to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/123?utm_term=attila+total+war+ere+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_60186900b43b9.pdfIn PDF document text
    • http://fomigiv.mypressonline.com/ncert_solutions_for_class_9_science_physics_chapter_work_and_energy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369166/normal_5fcda0334b87a.pdfIn PDF document text
    • http://vexawenebo.22web.org/fetinusutugizatufeluluj.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/tidezoziwokojidetipejize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_602f356d3adb5.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/fapaga/badlapur_movie_free_300mb.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/sokawixapufo.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/frases_para_fin_de_ao_escolar_primaria_cortas.pdfIn PDF document text
    • http://lebofimuvi.rf.gd/flight_reservation_form.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_4cc3dd4e4e6e491f9148b24ad6043c3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buwosevax/25988492279.pdfIn PDF document text
    • http://lodumojokexiku.onlinewebshop.net/leferekepumulelefej.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_bf985e4236c740afba7aab26ba689120.pdf?index=trueIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_65dfd73c63e041ecb521a613ce7163d4.pdf?index=trueIn PDF document text
    • http://xoviketi.epizy.com/application_development_manager_interview_questions_and_answers.pdfIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_3114d4f3dfd843fbb0d784ed44f7f7d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/98523632600.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/access_2007_report_sum_calculated_field.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_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 4896 bytes
SHA-256: 758fa806eb7571dd870d6b8ad18d5b85f8e54b7c4a54068e4aea67ea11e588d6
font_01_sfnt_off0001154b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154B 10936 bytes
SHA-256: 8873ec2178ba514422cacf90dea89b8a7b362c6636b0b5a2943d3ba21ba9fdfc

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