Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afcf4cdbaeb11f7…

MALICIOUS

PDF

66.8 KB Created: 2021-03-15 19:37:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 159da1652c38bba78c26d381c0f78282 SHA-1: 26211f4fcaf161981f31a090e8582d5ca4763e7b SHA-256: 9afcf4cdbaeb11f750635fd86097884d958bfbb34301c43b935692fe90098080
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

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://nipisod.ru/wix?keyword=little+tikes+toy+chest+tire
    • https://cdn-cms.f-static.net/uploads/4416496/normal_604a9b4bb89aa.pdf
    • https://bekajujoxofutit.weebly.com/uploads/1/3/1/4/131406668/3989b.pdf
    • https://cdn-cms.f-static.net/uploads/4412181/normal_602fe05fd4b8b.pdf
    • https://static.s123-cdn-static.com/uploads/4476927/normal_5fe3f07e7948c.pdf
    • https://bonawuxuje.weebly.com/uploads/1/3/0/7/130776103/vabozelevifumolu.pdf
    • https://cdn.sqhk.co/motuwezelu/fwxjxhc/54619599698.pdf
    • http://ferunasivagu.iblogger.org/alcatel_lucent_manual.pdf
    • http://desararixiwikos.22web.org/damijoxepojogakinomati.pdf
    • https://fivosegexaf.weebly.com/uploads/1/3/2/6/132683078/xepozaw_vitivoxorubefem_dufufaxefuj.pdf
    • https://cdn-cms.f-static.net/uploads/4493209/normal_60149fdd72849.pdf
    • https://cdn.sqhk.co/soziwariru/Ohcljiw/42274221885.pdf
    • https://static.s123-cdn-static.com/uploads/4490141/normal_5fc8dacbb1eac.pdf
    • http://vipimuxatomefi.medianewsonline.com/harry_potter_und_der_stein_der_weisen_hrbuch_gratis_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dovunufesesiz.onlinewebshop.net/irrigation_engineering_book_free_download.pdf
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_1ac1994b021f4a3a9dda545f202c7e09.pdf?index=true
    • http://zaluboxif.epizy.com/wagawan.pdf
    • http://duxepivol.myartsonline.com/movie_maker_app_free_android.pdf
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_a60fe64e6b77457498cb52ea635fd9a2.pdf?index=true
    • http://zowofiz.myartsonline.com/mass_effect_2_thane_romance_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cac4.bin
4137eb9723e332de4d6496a89564328aaf9ac8c6503d340465478a9e094b4769		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC4 4784 bytes
font_01_sfnt_off0000db0f.bin
35b814d84fbb0b4a37a50fbb3a60278ca06132b4de3f914c02f9395f9476aaf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 10536 bytes

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