Malicious PDF — malware analysis report

Static analysis result for SHA-256 106b251e12e7f3c4…

MALICIOUS

PDF

114.5 KB Created: 2021-06-05 18:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e2e7c7dc974e3d48a5dec08b3d7a8f60 SHA-1: b31bb805cbe74d586d204e1730e7e200a867a0c3 SHA-256: 106b251e12e7f3c4ac09a9ef723a56956efad5b77e6b9702468e16be1be775c7
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/123?utm_term=filmyzilla+bollywood+movie++free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415292/normal_605160eda14ce.pdfIn PDF document text
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/kegawaragadezubedod.pdfIn PDF document text
    • https://gemebavusoduwi.weebly.com/uploads/1/3/4/7/134746442/desasomifiwisirimiz.pdfIn PDF document text
    • https://vovejurumek.weebly.com/uploads/1/3/4/6/134644047/8738079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_5fd7b1b5df4ca.pdfIn PDF document text
    • https://doxeraja.weebly.com/uploads/1/3/1/8/131871607/387323.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144441213/lamilemofidupumelaxorix.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/sejerewamobemu.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/70866401168.pdfIn PDF document text
    • http://bunemirudezo.pbworks.com/f/jesoxotigusoxebowawonux.pdfIn PDF document text
    • http://lifevuve.pbworks.com/f/acordes_de_cancion_cantemos_al_amor_de_los_amores.pdfIn PDF document text
    • http://xodelow.pbworks.com/f/how_to_say_godchild_in_tagalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9afd74e2-143f-41b4-a24b-3ee661a00eac/gugej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc87599-0a80-42a6-89eb-fc16caba9b3d/14539041212.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001475c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475C 5272 bytes
SHA-256: 29476af40634f3d32f26f178167bb8452d6698574b1b6bd6f0d37f6a8331e732
font_01_sfnt_off0001595b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1595B 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off000164be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164BE 11100 bytes
SHA-256: 8911e91cd6f0092058ed6b6d8d3bb86d82f99f898d0a085c46961f1009d6289d
font_03_sfnt_off00018ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AB6 16448 bytes
SHA-256: 72c34d362cc63d8689dd01a2d21afbebd619df2c284b82af0bfca1efe62f6def

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