Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cc6d0c6b40a736…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 20:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 889157d43dff17c92080c62898cccb59 SHA-1: dec75f48b5a92117b0a538fe81c567cc807fd14b SHA-256: 98cc6d0c6b40a736493e19a0bc5e0b4d656f3e02f697e4164502074ac3be5bbe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of multiple suspicious URLs points to a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 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://alaskaproauto.net/nbloom/fckuploads/file/73638033664.pdf In PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091121111573499.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dj97o6a15q0kk6jusb4kf4sfrn/denuwuxemejevuronanabe.pdfIn PDF document text
    • http://pololanna.com/user_img/files/74734922778.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457cbf176fd---35387508446.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mipukinimupurikavuxozox.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/27859714842.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/zixiw.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/65090362552.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/14188937569.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/gekimumepikeve.pdfIn PDF document text
    • https://premiersuli.hu/files/files/zazigu.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/24498066149.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/nalanesamokurineg.pdfIn PDF document text
    • http://carcrome.com/userfiles/file/29130752039.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/zidanugopilebuzodiwafufu.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/47248350542.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/lizivuxilemumos.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/wexejosa.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/sowojupi.pdfIn PDF document text
    • http://brenderup.ro/mm/file/wujisofevaxazigabe.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/zusitigobafufan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dragon+ball+z+kai+season+4+episode+21PDF link annotation
    • 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_off0000ad2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2C 11012 bytes
SHA-256: a7f0f8fd3f64d37a42f4a2e3ab7f26e72d4e5f55964565f00614944d9a753896
font_01_sfnt_off0000c689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC689 17032 bytes
SHA-256: f4823be8394f5e1a3607e3cfb322ff5ca6d257028d0b4a89bda7231105ce57d7
font_02_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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