Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e7ca102f8dfe0a…

MALICIOUS

PDF

83.1 KB Created: 2021-03-24 03:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1a8ac32e25bc3d7117277cd73bdc547f SHA-1: 45b4c35bf909beabd46810603e39f8ae70a5f8ef SHA-256: f2e7ca102f8dfe0a104f3d859951fe72728fc165796e0fe54955e50bbd6a6660
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=answer+artinya+apa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374956/normal_6055ad7b3740a.pdfIn PDF document text
    • http://creditscorecard.info/is_macbook_good_for_computer_science_students44acp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_604469dbae2a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_601f2c3dc1126.pdfIn PDF document text
    • http://biotringel.shop/what_does_code_f_mean_on_a_cabrio_washerh8nwj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450427/normal_601a0ef67cebf.pdfIn PDF document text
    • http://mosdendy.store/diy_bat_house_dimensionsa5hf5.pdfIn PDF document text
    • http://spainsale.pro/holy_quran_english_translation_by_abdullah_yusuf_aliel8av.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_6034424aa3bc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491965/normal_5fee74049d646.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/hfTjbhg/53242139850.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407306/normal_5fdef4323b22c.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwilaj/fSjejhC/comic_reader_app_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480735/normal_604a5865ecbbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/068ccc7c-d2c1-47ab-bd9d-be936d4d3408/31932682204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a83a3e-b2d6-4821-b4ff-3f5f3456dfae/luginasoxux.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/cooking_for_geeks.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/febel.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/diablo_2_median_xl_challenges_guide.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_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 4964 bytes
SHA-256: 4403b3fe4abda89f52e6c90c1cd1b03210844d4cf5a2d722ba3018a6f15136b2
font_02_sfnt_off00011380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 13320 bytes
SHA-256: de263420a6bb35553f097ccedc27948864f36860fa7d506a2758aecb2d0a456b

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