Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83c5b07258f3cd9…

MALICIOUS

PDF

75.4 KB Created: 2021-03-16 02:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a961790f2212ffb63714e73a72cac645 SHA-1: 3d37ebcd1d1a484aac73b0e6eeaba8862278740b SHA-256: f83c5b07258f3cd9ea643b2b6eda033645013604d880a1447457fca43a38edf0
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain keywords related to depression, likely a lure to disguise the malicious redirection.

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://dafemum.ru/strik?utm_term=what+is+non+seasonal+depression In PDF document text
    • http://vuxetexab.22web.org/compress_adobe_reader_online.pdfIn PDF document text
    • http://juzajikadig.22web.org/humanistic_approach_person_centred_therapy_worksheet.pdfIn PDF document text
    • http://nujosanoze.iblogger.org/63133800019.pdfIn PDF document text
    • http://laregazobo.22web.org/universal_studios_california_map.pdfIn PDF document text
    • http://mililasapatiw.22web.org/basotinogaxabexi.pdfIn PDF document text
    • http://tiwirodizefa.iblogger.org/dalasemuxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumowopapog.rf.gd/slicing_pie_summary.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_e1f4134744ce4b3faa390b1fdd7408c1.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_22feecdcc1f547d0abd9044e3253f31c.pdf?index=trueIn PDF document text
    • https://0029a690-d003-4268-bdc7-e74daa5a0415.filesusr.com/ugd/a4b355_80d971a9b6e54731aec48ca286a382a8.pdf?index=trueIn PDF document text
    • http://xikufozumif.epizy.com/leatherworking_leveling_guide_wow.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/31151549173.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/kenmore_80_series_washer_timer_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/jadolopenure.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_364f9b4c4c5b443fa569be1e24380d5a.pdf?index=trueIn PDF document text
    • http://vudubozudavoso.rf.gd/easy_ukulele_songs_popular_tabs.pdfIn PDF document text
    • http://xetubuvij.rf.gd/86491303525.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/68850205036.pdfIn PDF document text
    • http://divifafapinuk.rf.gd/61701344544.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/toefl_practice_test_speaking.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/old_navy_school_uniforms_canada.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_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 5060 bytes
SHA-256: 9456d24b5af4778ecbc08884b103617a055b75fd56ca060675b6e5bc85d39ed9
font_01_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 10732 bytes
SHA-256: a99e884e5fb225285d37e89979ff42f9a01d4b5c28085906e890af56a2ed1ff8

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