Malicious PDF — malware analysis report

Static analysis result for SHA-256 efebb0add3f13c80…

MALICIOUS

PDF

73.4 KB Created: 2021-02-11 05:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6b4ca519de348c34ac6d322ae0e13fae SHA-1: eb317cc252e970cbc3eb3e2983c052e51dd8fc12 SHA-256: efebb0add3f13c802fe703ae33e8ec3dcee8c832c20f6c3954f4e8d0d0ac6af3
156 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. 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 0.9998

Heuristics 5

  • 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.
  • 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://crophysi.ru/123?utm_term=inline+electric+fuel+pump PDF link annotation
    • http://kulapub.22web.org/ecg_feature_extraction_using_wavelet_transform.pdfIn PDF document text
    • https://rijesire.weebly.com/uploads/1/3/0/8/130814070/9599119.pdfIn PDF document text
    • https://sixonawujow.weebly.com/uploads/1/3/4/3/134369174/fe20dfa2f6.pdfIn PDF document text
    • https://megigoxifiwovom.weebly.com/uploads/1/3/0/7/130740625/b54e6b408c1396.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/novuwofa_lunaled.pdfIn PDF document text
    • https://zuzefeza.weebly.com/uploads/1/3/1/3/131397950/abbacf9c3fc9db7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesogopobatobop.epizy.com/bestwap._in_movie_2002.pdfIn PDF document text
    • http://xoxejafomi.rf.gd/89940286146.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/brutalismo_en_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/rigak.pdfIn PDF document text
    • http://fizuxobitunoge.epizy.com/84238748970.pdfIn PDF document text
    • http://fuluputig.epizy.com/battleon_classes_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/waltzing_matilda_sheet_music_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/josephs_song_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/browser_android_paling_ringan.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/nefapoxamojex.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/tuition_reimbursement_policy_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/69242012869.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_off0000e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 4712 bytes
SHA-256: 96935ebd6357585617e74cd5dfa39b6829cb0e44e8a9299f5f9ad9a3340b3ce0
font_01_sfnt_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 10636 bytes
SHA-256: ef1e30987e5f8597678272b16cbe1ec5246779f19f12c35288a591f4120a7a31

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