Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13f37f22dbabaee…

MALICIOUS

PDF

75.0 KB Created: 2021-02-28 12:58:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 10bce5c4d5a3c3854442bf505a4f9c2a SHA-1: a97dd2c8cd870e8cc35ba441cd76196c93a994b3 SHA-256: d13f37f22dbabaeeda5af58fcfc1735170111e513bf43812063a36f71f14e3b0
214 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 and routes users through malicious redirector infrastructure. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+drain+kenmore+500+washer In PDF document text
    • http://bibivire.mygamesonline.org/sevojifago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_5fe7cce381ec6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_6026b6169d6f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460447/normal_5feddfacd157f.pdfIn PDF document text
    • https://gagegopered.weebly.com/uploads/1/3/4/8/134880179/gutetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376850/normal_5fd67080b2ccd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416501/normal_5feb32f354211.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385612/normal_5fff68b9b87a8.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/vubomewotufose_xazijo_jumujetu_kobosov.pdfIn PDF document text
    • https://mipadabu.weebly.com/uploads/1/3/4/7/134751654/dofolawisikivu.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/how_to_calculate_solvency_ratio_from_balance_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409826/normal_60023b86a002e.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/1447374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470703/normal_600f77ba07364.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373508/normal_5ff0813c4b49c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bifovigavij.myartsonline.com/fenix_2.0_vs_fenix_pro.pdfIn PDF document text
    • http://girofili.myartsonline.com/7849212427.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_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 5416 bytes
SHA-256: 229c766afa614d27256c6961fc770e165e1dd3a7bbca00c75b0e477e92d6c8bf
font_01_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 11408 bytes
SHA-256: 46956d7146accf4c9ab2e7f5c1d8fe5521ef7f79b7506e4180146c1f4bd5f9a6

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