Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b1cf865bf98abd…

MALICIOUS

PDF

86.9 KB Created: 2021-04-21 08:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a810d9a003b351032ed1e6def67a11f8 SHA-1: 009fa18b135df952e05eec306f72b067f9e871b0 SHA-256: d1b1cf865bf98abd6341d908f216e71a438600c7a9654c613c4112ce1d1070cb
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with text related to a light novel. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of malicious URLs and the document's structure suggest it's designed to lead the user to a harmful destination, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://crophysi.ru/strik?utm_term=overlord+light+novel+volume+13+translation In PDF document text
    • https://cdn.sqhk.co/dizukenepu/i1CfjeC/samsung_internet_browser_download_paused.pdfIn PDF document text
    • https://cdn.sqhk.co/zujijivopuju/0jajdif/zepelijejox.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/idmWFhg/32931003530.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/ghkgd7G/survivor_redemption_island_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/prjbM6b/kelibono.pdfIn PDF document text
    • http://servempieza.site/what_is_special_personal_auto_policyudlme.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/giauPhe/leweripogonibosidolifu.pdfIn PDF document text
    • https://cdn.sqhk.co/fopeziriga/oiaZcjh/weird_and_awesome_facts.pdfIn PDF document text
    • https://cdn.sqhk.co/tanusulirava/HhLSuih/kipugerefele.pdfIn PDF document text
    • http://vivadoctor.ru/crossfire_series_book_3_onlinemjie7.pdfIn PDF document text
    • http://sexesex.site/blank_sheet_music_staff_paper1hyxp.pdfIn PDF document text
    • https://cdn.sqhk.co/kenalutaxi/igexgjt/manual_blood_pressure_machine_parts.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/wutezigojuxi/why_does_my_brother_printer_print_black_lines.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/wofexexoferozafa.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/21537377671.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/5372373273.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/behringer_x1204usb_usb_audio_mixer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 3672 bytes
SHA-256: 6bae95e9d9786193ff3d71e5c7518fa8411a7f1951fe512c4550bf51b376424d
font_01_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 5540 bytes
SHA-256: 4647830d6c17485a41e1a8a09bc3455cb54cb86c1fccd1781768372815b67a72
font_02_sfnt_off0001224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 13040 bytes
SHA-256: 3fa6ba410a50a8573ec73e3deb87374be44877a9084d18ea56514ef55f8df49b

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