Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1137598ae8ca27d…

MALICIOUS

PDF

78.0 KB Created: 2021-04-02 23:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7b3ad1ee2c74a9820b1fb7611e814904 SHA-1: 474f53847c04045c037b6bae0042299752dfc60a SHA-256: b1137598ae8ca27d0161b777293f1de9224f86c42c99a0d5d3a02230a15d4acc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The primary URL observed is `https://midufefew.ru/123?utm_term=avaya+announcement+wav+file+format`, which likely serves as a lure or initial redirection point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/123?utm_term=avaya+announcement+wav+file+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451035/normal_603948564b194.pdfIn PDF document text
    • https://febotobelem.weebly.com/uploads/1/3/0/7/130739539/fularidogesofipupon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492574/normal_604b847a0993a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416919/normal_5fccb0d771daa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_60235ac0a947d.pdfIn PDF document text
    • https://kanexunife.weebly.com/uploads/1/3/2/6/132681916/monaputakegavo-wewelobiwip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_60225d3e8d545.pdfIn PDF document text
    • https://tekerigaxigo.weebly.com/uploads/1/3/4/7/134702693/sigumemuj.pdfIn PDF document text
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/7563253.pdfIn PDF document text
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/gujefeledazikiw.pdfIn PDF document text
    • https://buwirudoxux.weebly.com/uploads/1/3/4/5/134597973/jofuxedomewaz.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/Nwgha9p/download_rush_rally_2_mod_apk_revdl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458631/normal_6004097e969a5.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/Ajgheja/war_dragons_marav_spells.pdfIn PDF document text
    • https://voxivunesiru.weebly.com/uploads/1/3/1/4/131407918/kisul_tilalutokomijo.pdfIn PDF document text
    • https://funosojo.weebly.com/uploads/1/3/5/3/135336125/d828c.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/vedobakinese.pdfIn PDF document text
    • https://cdn.sqhk.co/mofekuma/eujehaV/76920875610.pdfIn PDF document text
    • https://tofuxatedev.weebly.com/uploads/1/3/4/7/134706151/mewozudagusox_dufer_luxapeno_jaratof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_c7b648cc8c674c0691dce29f28e67832.pdf?index=trueIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_ea67db3460bf45d49563e11dd77af74f.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_aa08cccdd04d46d0a5509d3505af4519.pdf?index=trueIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_e25d76a5593343b78dc6d4d446fe9e37.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_80afe115f95f46288a6830578fad61eb.pdf?index=trueIn 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_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 5092 bytes
SHA-256: 79e1505cf71d79d44b66fa32dd44ae7bac24d2177794dc45673ace08643ca8d9
font_01_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 10876 bytes
SHA-256: 647006a856b66a62edea1f0f5d8b640d322bc6902d66f555e5165c2908abe3be

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