Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f9623a905fccd5…

MALICIOUS

PDF

105.4 KB Created: 2021-05-29 19:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 197f77128ca2e7db2e0c16ea49ed9580 SHA-1: dffdaeeb0403a39b3e4e713c3573b05e4345edda SHA-256: a6f9623a905fccd5a43a6714289e1ac75279580d960b3031fd6d89a095bd963c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

Heuristics 6

  • 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.
  • 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://xajibur.ru/123?utm_term=5+south+african+based+food+dietary+guidelines PDF link annotation
    • https://nagozexifetuli.weebly.com/uploads/1/3/4/3/134340384/4bdb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471946/normal_605d967488814.pdfIn PDF document text
    • https://deperomider.weebly.com/uploads/1/3/4/3/134344929/dosematog.pdfIn PDF document text
    • https://nutoxabalatejo.weebly.com/uploads/1/3/3/9/133997198/sezazarud_tawaleke_nofula_lodavom.pdfIn PDF document text
    • https://gumopaxegekugod.weebly.com/uploads/1/3/4/0/134018731/kerekokawinogugoru.pdfIn PDF document text
    • https://sixevajerav.weebly.com/uploads/1/3/5/3/135341720/6554854.pdfIn PDF document text
    • https://pederojelukeb.weebly.com/uploads/1/3/4/8/134859697/xabitanu_damilodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_5fd105a440af9.pdfIn PDF document text
    • https://vudufidobisij.weebly.com/uploads/1/3/4/6/134673615/womop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_6042c53029c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_6018352b9ed79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_6021098a0a1f8.pdfIn PDF document text
    • https://xupotigoxurope.weebly.com/uploads/1/3/4/6/134657266/378642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_600d9b903a6c9.pdfIn PDF document text
    • https://bifuwesulowun.weebly.com/uploads/1/3/4/3/134308915/vesiseluliw.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/2725842.pdfIn PDF document text
    • https://gasogufimuti.weebly.com/uploads/1/3/4/4/134461051/9686479.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/tidobapaboko_novotuzipezebaf_dulajisitijef_mezuxal.pdfIn PDF document text
    • https://parukiwodisurup.weebly.com/uploads/1/3/4/4/134455528/4e70e.pdfIn PDF document text
    • https://buronunizapa.weebly.com/uploads/1/3/5/9/135956875/1505456.pdfIn PDF document text
    • https://weritudasokapo.weebly.com/uploads/1/3/4/4/134494226/7916868.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00015ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBC 5552 bytes
SHA-256: d46e1768a90278c6636d6bfd5b3cbdd14949454044e734ed503f1a08fb325a36
font_01_sfnt_off000171a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171A1 11316 bytes
SHA-256: e14c8a348dccca9fdd2184c363fd9c70062ac1d768a49ee4e48064ef62cb4194

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