Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b6b0b01b7d3d9f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-22 21:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b10f1ea75c70c0cf4f010612729af13 SHA-1: 19c47efe7bbb01873918b2ae99e939eaf5712c43 SHA-256: f9b6b0b01b7d3d9fa120343a8535274c2f8a9ed93c192fbeede5ef6a6ff7d8e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=black+clover+ep+6+eng+sub PDF link annotation
    • https://natinsel.com/imagenes/file/33393777905.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/bizitufibobivutal.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/63268177064.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/85604744216.pdfIn PDF document text
    • http://linker-apps.com/files/36020429839.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/1630918476.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/228c6ced6ca355de829b9f19f24312ed/radozom.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/wutafugipujarewewu.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/79095022403.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/pinaji.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/xenosobe.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/tavodenijawixaxas.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/71917697159.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/30092964732.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/57562720395.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/71616419289.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/jilelowugotegigumoz.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/52906037799.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/59095180773.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/41937562250.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/potapegaparudisavagip.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c2520e5364c78c36222fd6f8eb218a12/4815396998.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/4918814320.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/rifikiwanexogamunenepeli.pdfIn PDF document text
    • https://premium-house.uz/images/file/69470028918.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB728 10980 bytes
SHA-256: b70571451116e9006aee9bda6c754efd034be6ed2242988e00aa153ab2966fc2
font_01_sfnt_off0000d0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 18116 bytes
SHA-256: 83f1c961f0253dc8012e0c3c4a42b8d4f82ae109b406c6b9087fabd171fcd80f

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