Malicious PDF — malware analysis report

Static analysis result for SHA-256 b248f856d2bd3e3f…

MALICIOUS

PDF

74.8 KB Created: 2021-02-24 10:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 0bf8f0a27ac10e4f92a60dfd14864317 SHA-1: fb24921dd580c37520154f743ef9becd43ccdd07 SHA-256: b248f856d2bd3e3fd5120f3260c5bcb53c0d215912cc4356c3402be4958d164e
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wb?keyword=columbia%20data%20science%20masters%20requirements In PDF document text
    • https://cdn.sqhk.co/novigigexuxo/LOAiiga/mobile_legends_for_pc_windows_7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5fe3104c7840d.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/iijiahi/31149687492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379726/normal_5ffe29b478cec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378599/normal_5fe3c87484a78.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/9440416.pdfIn PDF document text
    • https://cdn.sqhk.co/sawitofi/hchh7ih/xuxamaxaletulazusarupi.pdfIn PDF document text
    • https://cdn.sqhk.co/kapipota/hgLhahe/city_car_driving_download_free.pdfIn PDF document text
    • http://simabozarulo.iblogger.org/tulosujonufara.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/roware/i_95_traffic_report_in_south_carolina.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/88928680167.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/16000401478.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/project_kick_off_presentation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/courageous_resolution_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/brother_2270dw_error_light.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/paglu_bengali_song.pdfIn PDF document text
    • http://sitotozip.rf.gd/42493026920.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/osteoporosis_screening_guidelines_us.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_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 5256 bytes
SHA-256: dc2c16523ae0865d810ab096752194526f5091d6e9d50be6e10983b3e88b353f
font_01_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 10468 bytes
SHA-256: a8acdf230843f773984574c92d3bcaef0287064a8b17a1ddd252f5c95eb7cf40

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