Malicious PDF — malware analysis report

Static analysis result for SHA-256 f473e9561ef90690…

MALICIOUS

PDF

72.9 KB Created: 2021-01-20 11:46:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6ee8cdfb408794623727a2f74636165e SHA-1: a5d046e1fb204473525978a56d4ccf489db5e085 SHA-256: f473e9561ef906909de6c493fedf4d31d8ab9449af211535278bf4f221dd8e25
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farm SEO spam or phishing campaigns. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically flagging it as a phishing trojan. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM suggest the primary goal is to redirect users to potentially harmful external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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=connect+accounting+answers+chapter+10 PDF link annotation
    • https://cdn.sqhk.co/xafiguzi/9Jyhhie/53086938495.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/bekikot-kusikoki-silidebavifuro-vorukakukijorun.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/bjbhbij/best_deals_on_tvs_today.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/2400864.pdfIn PDF document text
    • https://wejuwano.weebly.com/uploads/1/3/1/1/131163718/vinezaxaz-xoxem-mobosobodinejem-biluxuvuxapu.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/gfvgcFl/flip_water_bottle_challenge_fortnite.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/Bjj5Gif/boxcryptor_download_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/1kibWhd/bugopozij.pdfIn PDF document text
    • https://xebejadeveroj.weebly.com/uploads/1/3/0/9/130969735/kinuwimifas.pdfIn PDF document text
    • https://cdn.sqhk.co/lutugivaje/dejchaH/25357931557.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/gertgfR/mi_smart_band_4_pulsera_inteligente.pdfIn PDF document text
    • https://cdn.sqhk.co/sevidekepige/jNIYjjz/scruff_a_luvs_babies_rescue.pdfIn PDF document text
    • http://centre-blannaves.frIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://meduzifovum.epizy.com/gefetev.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/11796838338.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/liripoxaromu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD149 5352 bytes
SHA-256: 6530cce9b3e557e4d18f19ef92dc04fd82b89784fbe683f8fe6aee1d75775534
font_01_sfnt_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 10840 bytes
SHA-256: 7d737a1604053100372ffd65965bd9ec0398efdff6b874596bc521dbb5a1f129
font_02_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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