Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb6e9ea56833ae7…

MALICIOUS

PDF

69.9 KB Created: 2021-01-30 05:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e2159f36eb1df253d45322480452ecef SHA-1: 87f002ca04beec5b5407061fcb8eb51116fe1e64 SHA-256: 8cb6e9ea56833ae7b8e287afc0494a4f2528f9bbc43c143c9262ee42cfa1f7d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, with one pointing to 'baarspo.ru' and another to a link farm on 'epizy.com', suggesting a phishing or malware distribution attempt. Heuristics indicate it's a link farm on disposable hosting and ML classifiers strongly flag it as malicious. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The presence of a download button lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/123?utm_term=kubernetes+up+and+running+free PDF link annotation
    • http://contact-git.top/sartorius_muscle_stretchesrn3p9.pdfIn PDF document text
    • http://buvemalo.66ghz.com/android_auto_whatsapp_nachrichten_anzeigen.pdfIn PDF document text
    • http://regsenatvumen.website/2164079543qechz.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/vagogajeni-niziz.pdfIn PDF document text
    • https://mopijijexexer.weebly.com/uploads/1/3/1/8/131871517/regulifozajet-bogefatul-tatijexelozagus.pdfIn PDF document text
    • http://xogakijukutikep.22web.org/16246265466.pdfIn PDF document text
    • http://techanomic.com/6915981662esyfl.pdfIn PDF document text
    • http://barashik.space/riletumodipvip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widafasamuj.epizy.com/12100894068.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/ableton_live_9_user_manual.pdfIn PDF document text
    • http://kegunujav.epizy.com/80152385747.pdfIn PDF document text
    • http://kagiwabiluwotel.epizy.com/purorodovowodored.pdfIn PDF document text
    • http://lobulowigewimu.epizy.com/welol.pdfIn PDF document text
    • http://bakenexiradofo.epizy.com/lurebabadofoduber.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/peranedamujamaroj.pdfIn PDF document text
    • http://kepipejesa.epizy.com/best_manual_burr_grinder_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/ponokesevosukisebuvakase.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/amharic_bible_application.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_off0000d37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37D 5288 bytes
SHA-256: 3bd5ff1c5b8ac6b4f522e02a5b2c84b7e596924d1b1a43713b06c7555042e570
font_01_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 10728 bytes
SHA-256: ed1cf0930d7d76d65410a9756bda7bc189529841c90f4539d1a4e1cea1fcbd9f

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