Malicious PDF — malware analysis report

Static analysis result for SHA-256 f794ad0a8985d603…

MALICIOUS

PDF

74.4 KB Created: 2021-04-14 13:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cfbe8673165574881632632bd90297bf SHA-1: e19995645326b1a00b3a18a5405a74b16923ed3b SHA-256: f794ad0a8985d603196fab6ddc3dcb938ddb46bbe0e6dfe476a74d6a9c2c2e43
186 Risk Score

Malware Insights

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

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 0.9993

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://jumiwimov.ru/strik?utm_term=red+short+haired+mini+dachshund+for+sale PDF link annotation
    • https://zewekoli.weebly.com/uploads/1/3/5/9/135966642/5947760.pdfIn PDF document text
    • https://kakifiku.weebly.com/uploads/1/3/5/3/135347754/fusuliwisekizu_puzexo_mowajikexa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417123/normal_5fff7a0747002.pdfIn PDF document text
    • https://xuxerativizujaf.weebly.com/uploads/1/3/1/0/131070719/5371943.pdfIn PDF document text
    • https://xukifunizagopo.weebly.com/uploads/1/3/4/0/134013279/nalepofitata-potimakoside-dejisasobabefif-juxomekam.pdfIn PDF document text
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/mebijodotaw_jabuxumefuvepo.pdfIn PDF document text
    • https://rasafidi.weebly.com/uploads/1/3/0/7/130776861/doninu.pdfIn PDF document text
    • https://tupinikuwexopej.weebly.com/uploads/1/3/1/0/131070806/kugajopulevarazig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_600dc97f43041.pdfIn PDF document text
    • https://vusutiti.weebly.com/uploads/1/3/4/7/134762674/cf4f0b03aae35.pdfIn PDF document text
    • https://xulewanexu.weebly.com/uploads/1/3/4/1/134108589/6a53749f77ad.pdfIn PDF document text
    • https://taleputara.weebly.com/uploads/1/3/4/3/134305900/zitatasid-bunipitosaputiz-sepajela-zetokuw.pdfIn PDF document text
    • https://xajekegok.weebly.com/uploads/1/3/3/9/133997321/1c0cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393029/normal_5fce657f4c74c.pdfIn PDF document text
    • https://xewulatejema.weebly.com/uploads/1/3/5/3/135345986/c6a894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5fdd62419cd01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_6042f7e9bcd3d.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/1bd731a2-1c28-4ebf-9bc5-bc87cf2b36bf/graco_contender_65_base_width.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f1ff70-3bc9-43fb-8955-82da44e21dab/vita_spa_hot_tub_jets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88baadf8-6a36-4571-b679-a93d59c7b3fd/walmart_black_and_decker_spacemaker_toaster_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c3e43e-5e25-4286-a97f-afcf286ce8e1/magic_chef_refrigerator_mcbr1020w_not_cooling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2203ed-6702-4f4d-855c-80d6efebb126/el_amor_en_los_tiempos_del_clera_resumen_por_captulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa2486e-795a-494a-9119-85044ed68939/walijamusikimugetuzenu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 5268 bytes
SHA-256: 4617e096144e5ba40430dfae5cc44f8fd7e77eda5aad3d48676d88ddbfb9d2b5
font_01_sfnt_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 10848 bytes
SHA-256: da415db84a2a6dc64713dfb2ea2e9895bb16655b8a333829c5a212bf8dd450b0