Malicious PDF — malware analysis report

Static analysis result for SHA-256 516e619d757f4907…

MALICIOUS

PDF

130.1 KB Created: 2021-05-19 23:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ca03f44f204e44f9bda29810654a6622 SHA-1: 9ad1c66cb0f8d7b4d0ef5ddf8e3b128b9b478bc2 SHA-256: 516e619d757f49075f7095f6cf1ae4c3be16c123740863c56c90a8cd463ed0b1
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 0.9996

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://jumiwimov.ru/strik?utm_term=holt+science+biology+food+chains+and+food+webs+worksheet+answers PDF link annotation
    • https://nuxofenaf.weebly.com/uploads/1/3/5/3/135306259/3549276.pdfIn PDF document text
    • https://rofasaxoropop.weebly.com/uploads/1/3/5/3/135316675/nojesobatakumaso.pdfIn PDF document text
    • https://nimifitirujaga.weebly.com/uploads/1/3/4/6/134693460/6201008.pdfIn PDF document text
    • https://lutenidu.weebly.com/uploads/1/3/4/3/134398581/vatubapetom.pdfIn PDF document text
    • https://mibubibot.weebly.com/uploads/1/3/1/8/131871690/gosagupepozewa.pdfIn PDF document text
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/8191653.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/49905576259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f5be85-7608-4f4f-8543-914e2a4a0315/best_powered_speakers_for_audio_technica_lp60.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/17925888518.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/wefewamejagoxagizala.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/94792000205.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/geotechnical_engineering_companies_in_durban.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/logitech_f710_controller.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/nilizutotonimanatudeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/255d5ed5-a2f5-434d-9eaa-812839cbe101/60014511146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5594858b-d931-4d1d-a71c-1b1116cbaa85/rebis.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/temuwifes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0acae81-8d09-473a-8a45-094636ad584b/36478106718.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/46972983366.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/97894675203.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/33253718682.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_off0001bb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB46 5640 bytes
SHA-256: c3033b48adf9e4d668d5985d9cb1762a4b097a98cd5688481f2e702a1a1f4a71
font_01_sfnt_off0001ce88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE88 13564 bytes
SHA-256: 56b1b0043d14561bfb59bd5cfa5a3f0b43e9c96100be4e652a4b2fc4d85c1589

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