Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b61eaebecc7e852…

MALICIOUS

PDF

90.0 KB Created: 2021-03-06 04:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6f04320ad28b13b958817db8ea4e7e06 SHA-1: 20f61cd62c596efd6180b272d024a1cd19aeb706 SHA-256: 0b61eaebecc7e852b1a2bb7e352492fae6037782d97e6e6b075da7cf920c832e
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links pointing to external websites, many of which are hosted on disposable domains or link farms. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate a link farm strategy. While no scripts were directly extracted, the presence of many external links suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://zajinet.ru/123?utm_term=was+forged+in+fire+cancelled PDF link annotation
    • https://cdn.sqhk.co/modajili/WQ8vgjG/likepedela.pdfIn PDF document text
    • http://profapp.pro/88848843633s7vcf.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/casio_fx9750gii_manual_en_espaol.pdfIn PDF document text
    • http://wow50.pro/85116902144gcp73.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/ghhiDbP/6960318131.pdfIn PDF document text
    • https://pefuwopiluja.weebly.com/uploads/1/3/4/5/134592541/2175521.pdfIn PDF document text
    • http://soul-felt.com/azla_mutlu_olmak9zvfe.pdfIn PDF document text
    • http://servempieza.site/how_to_reset_epson_69_ink_cartridge_without_chip_resetterxveic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448339/normal_600f17de8ebe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_6020b325e023e.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/lobokewilusatexigo.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/0E0ggij/kujagamavepibexux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482848/normal_5fe786f2214cb.pdfIn PDF document text
    • https://cdn.sqhk.co/giruzegovu/f8hbSAh/rusk_deepshine_conditioning_cream_color.pdfIn PDF document text
    • http://umkatrade.ru/bafojesevipakawegesemapiqj53z.pdfIn PDF document text
    • https://dovidememalow.weebly.com/uploads/1/3/4/6/134601329/9277022.pdfIn 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
    • https://s3.amazonaws.com/setaxilitozuko/manual_caldera_peisa_duo_f_error_5.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/honda_eu3000is_oil_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/cacti_templates_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/jaxovelujagezoluj.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_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 4908 bytes
SHA-256: f5094bcc166b595fb9f71aad78a9900d0556ad6042adafe384f8d89a26f5aa77
font_01_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 11300 bytes
SHA-256: 118f71f1de7213cfd9735fddc1bc5aef4cded8937e0b325e622e356d25a32218
font_02_sfnt_off00014c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C73 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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