Malicious PDF — malware analysis report

Static analysis result for SHA-256 1335eb72b6880473…

MALICIOUS

PDF

72.4 KB Created: 2021-03-05 17:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 736cd0acae0cc390bac510b41d0ffe5d SHA-1: 8fe21bfc6df7d6c21478960c9e10ea2d4b3c2cfb SHA-256: 1335eb72b6880473ee9ef8b49c8090b096760c2cf81dbceb7090703eb80d386f
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, references 'Dr seuss week 2020 ideas' and the authoring application 'wkhtmltopdf', likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/wix?keyword=dr+seuss+week+2020+ideas PDF link annotation
    • https://cdn.sqhk.co/noperizapewo/ihenhjl/nudijewute.pdfIn PDF document text
    • https://fuwurobo.weebly.com/uploads/1/3/0/8/130814642/gepamulesavexunitum.pdfIn PDF document text
    • https://gerogebu.weebly.com/uploads/1/3/1/6/131637886/daguzekiwulosurina.pdfIn PDF document text
    • https://cdn.sqhk.co/korebuxaguz/6gdhcji/mad_max_glory_road_cast.pdfIn PDF document text
    • http://dimukidiri.iblogger.org/koduzowivavinuribut.pdfIn PDF document text
    • http://dekiweragaf.mywebcommunity.org/25843490380.pdfIn PDF document text
    • https://kalepadakib.weebly.com/uploads/1/3/1/6/131637037/jiwonaxo.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/44749157970.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/js3igcN/luziwaxamagiwide.pdfIn PDF document text
    • http://novinove.iblogger.org/peviwuranebisofiju.pdfIn PDF document text
    • http://zagimafe.22web.org/joplin_globe_tv_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jufomotapi.epizy.com/41945172335.pdfIn PDF document text
    • http://lesexuxu.rf.gd/42465239564.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/zosil.pdfIn PDF document text
    • http://kirubawebur.rf.gd/population_standard_deviation_ppt.pdfIn PDF document text
    • http://mawuxukajenup.rf.gd/27830646044.pdfIn PDF document text
    • http://tovajukoxeboder.epizy.com/chu_chu_tv_songs_mp4.pdfIn PDF document text
    • http://venonerenosuzan.rf.gd/cartoon_cat_face_images_free.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_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 5216 bytes
SHA-256: ba25a35ae5ce80986c9ae5f9cda3737cd0d5bb93d7086e75e3da82e7efb23264
font_01_sfnt_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 10160 bytes
SHA-256: 8cc4006d3c780473a74331ba67e146cb1f4aa89190dd2af1032a7724849aac37

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