Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ccf5f537809a5bd…

MALICIOUS

PDF

77.0 KB Created: 2021-03-22 01:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4e2189b07b739cf72eae71314c747285 SHA-1: 25e1b9671158d2b71d2fc19ecd694b77543a1705 SHA-256: 4ccf5f537809a5bdeeccb1ed8e02a083355a0d9b9bf751029b465f0b80823e09
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The primary malicious URL identified is https://seumenha.ru/strik?utm_term=hp+7110+review.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/strik?utm_term=hp+7110+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403540/normal_602f95422f26b.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuneduzib/ib2ichh/pedaketovetefavapo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5fcef7ff5abe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_6013e692e5963.pdfIn PDF document text
    • https://cdn.sqhk.co/lomabufu/gezLwja/sowuxewowo.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/8A9x35L/79014056925.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/jijhdih/radobika.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/wbC5ghG/45735013311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_604cb5b55322f.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/wheVheb/best_mirrorless_camera_deals.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/Ugje0jh/pool_billiards_pro_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosudav/bieWhf7/french_nail_art_designs_with_rhinestones.pdfIn PDF document text
    • https://cdn.sqhk.co/bubuzibiv/jrQDAI8/92693752807.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_677e870d65af4ed69f56b33a1c73c5a4.pdf?index=trueIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_070540b6465d4e85be136d1e4a5d09d9.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_fd1254ebee344b188e246f5ed7e1884c.pdf?index=trueIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_cc30a141d3c34d92bf199cc44ee8ec31.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_62855de87e2d4ea8b46a063f279e115f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisute/bewitched_tv_series.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_7c83e16f70bc432eae32fdc44f637923.pdf?index=trueIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_29de9ca8c8f94e3e818d857ab31d252f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/jabariya_jodi_movie_filmyzilla.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_857c71b4bfcf408fb1d4d4a317c0b7e9.pdf?index=trueIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_554e78e3a66f40c1bc151aa8afc74434.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 4780 bytes
SHA-256: 6966ff82ea989486e274da364a710d4d321b76786d69eaaec05b6b3c512fdf8b
font_01_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 11224 bytes
SHA-256: 7c585985846f73b3004964874397e30c743ffffb1307c0cf0cbd655c27b60ecd