Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a93bde10846a5e6…

MALICIOUS

PDF

73.9 KB Created: 2021-03-03 11:45:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b3109cb09c019439621d8fafd1766bc0 SHA-1: 594d65f446fcb5b82529b170b9eb5b196cbcc455 SHA-256: 2a93bde10846a5e60dbce07d2b787f484bc9ce30e114d1629c2ec21c68bc7e46
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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://vilenefex.ru/strik?utm_term=what+does+light+relief+mean PDF link annotation
    • http://vukesis.iblogger.org/wusanizepokusox.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/share_jesus_without_fear.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/9560001.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuwemiromi/VYqajmj/95469983598.pdfIn PDF document text
    • http://tesevamomavuruf.22web.org/girl_guides_ontario_summer_camps.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/fapotap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_600eaf7570a7c.pdfIn PDF document text
    • http://wosozage.mypressonline.com/jeep_grand_cherokee_wk2_workshop_manual.pdfIn PDF document text
    • https://zujuwaxi.weebly.com/uploads/1/3/5/3/135307850/9173302.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/IjdheYE/jbl_stereo_speakers_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449793/normal_5fc8e1e381fe7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tixeligufokup/12435155213.pdfIn PDF document text
    • http://ximumipos.rf.gd/calciform_500mg.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/ascension_du_mont_blanc_guide_chamonix.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/phonics_worksheets_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/roluwefuwijifigovabuledos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 5120 bytes
SHA-256: 2bc4bb7c6ace0befee73920696324889177fc32f8dc947992e427b50a182d41e
font_01_sfnt_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 9788 bytes
SHA-256: 79ea8f7f261ada6a6a9b0cf80259334361d6e33a493f5c27cb8ac799afdaaab0
font_02_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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