Malicious PDF — malware analysis report

Static analysis result for SHA-256 7487bfedf4405858…

MALICIOUS

PDF

191.9 KB Created: 2021-02-08 22:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a0fb0136e0630e7e6a3e59ea277e8a74 SHA-1: 4552d9cc5e9ef0a66eaa0acd47cdf9d6cb8cf204 SHA-256: 7487bfedf4405858db68f362d30cda2e3089903b9f8ac3868541c40f5d3753ad
134 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. It uses an urgency-based lure. 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 0.9987

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://maypoin.ru/aws?utm_term=sepsis+guidelines+repeat+lactate PDF link annotation
    • https://kukuziso.weebly.com/uploads/1/3/4/4/134468315/3370003.pdfIn PDF document text
    • http://smm-target.ru/sovajebiropikurugilefosuf.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/kiwilafigifitudiginotib9rn3l.pdfIn PDF document text
    • http://kernig.pro/sanasoxabooc.pdfIn PDF document text
    • http://xinupavob.iblogger.org/67847075371.pdfIn PDF document text
    • https://jaxoruxevag.weebly.com/uploads/1/3/1/6/131606876/8515304.pdfIn PDF document text
    • https://ludabasekid.weebly.com/uploads/1/3/2/7/132740342/nisevoxetumip-tesurujeluj-xuzomewewar-lepanaxozovezov.pdfIn PDF document text
    • https://cdn.sqhk.co/migixurej/AYqgfje/banoxeromapaxoxuja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suxiweke/27309588325.pdfIn PDF document text
    • http://gadexasumale.epizy.com/escape_room_level_100_to_120_answer.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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
stream_006_off0002c88a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C88A 23448 bytes
SHA-256: 76e0b91ae0f3e8c7563e45c6b5afce039cdffd7fd76526b2272332a186add9ac
font_00_sfnt_off00028a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28A58 5344 bytes
SHA-256: 774bc04038163a732b57192510b372ec73eba8269e7aa4a78d4965b70b7788ba
font_01_sfnt_off00029c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29C8B 14448 bytes
SHA-256: 0687f86e3fa373fb0a610e851c20cb1def4bae5b8077673317678abc030ae67b

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