Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fded3641f10fef9…

MALICIOUS

PDF

64.5 KB Created: 2021-01-31 21:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6c3ba34b66d1a9d0eab790508055e18c SHA-1: 9a14be1348b2b44a4f75d7f912ebcbc75dacd4e3 SHA-256: 9fded3641f10fef9cbf46296d9ec739079d74743bceb46b1898b619cd39502cf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://seumenha.ru/123?utm_term=sonic+diet+cherry+limeade+slush+nutrition PDF link annotation
    • http://tisimewifexumi.iblogger.org/50118981172.pdfIn PDF document text
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/3831293.pdfIn PDF document text
    • https://burodinijosago.weebly.com/uploads/1/3/0/8/130813714/robofigapu-dabes.pdfIn PDF document text
    • http://astrohelp.space/famous_hashtags_on_instagram_to_get_likesiemt0.pdfIn PDF document text
    • https://falosaxosudo.weebly.com/uploads/1/3/4/0/134017699/3163957.pdfIn PDF document text
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/sosogi_safoxurasiwun.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/womirofop/bipop.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/76469907476.pdfIn PDF document text
    • http://zowomazo.epizy.com/wolfenstein_the_old_blood_trophy_guide.pdfIn PDF document text
    • http://gopudagob.epizy.com/roledavutodi.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/embarazo_molar_caso_clinico.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/46896985704.pdfIn PDF document text
    • http://gedijusopekud.epizy.com/video_er_professional_android.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/bodyguard_movie_song_video.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/solve_by_completing_the_square_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/69184083551.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_off0000c08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08B 5384 bytes
SHA-256: bd3f01d0ee19e1868bb72cb8781e66223a0098d034f2268f16bd33a1dbdb8fea
font_01_sfnt_off0000d2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AD 10052 bytes
SHA-256: 38fd775c3bd605b832d8c7a3421a6568746e60801b2e9b8c65c9e2de95b5faf5

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