Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ad55245fc52e59…

MALICIOUS

PDF

62.8 KB Created: 2020-11-13 22:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fa21d8ce377a07885fe0ae28620afcdd SHA-1: 2081f0b543d1fa81272863b3e095301b2da318c2 SHA-256: 04ad55245fc52e59cd0ad4db09ff6a2c8a1b9d48afdd62ef5e90eafc70928b0c
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 0.9997

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
  • 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://cctraff.ru/123?utm_term=my+little+steamer+go+mini+directions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_5fa84d920f18a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5f8dc1525aef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5f8b953bc6089.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/tepenu_jumiwisup_jilaba_jupivadonuwob.pdfIn PDF document text
    • https://rutepoger.weebly.com/uploads/1/3/4/5/134509459/225123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420031/normal_5fa82d7f8278c.pdfIn PDF document text
    • https://menaxogem.weebly.com/uploads/1/3/4/4/134432074/9d1f7c0f21637d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5f8dc78443c6b.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/ziwuvijevo/new_york_city_criminal_justice_reform.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/21114872095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/526a20ed-d5eb-42a1-918e-db8795a1d5e5/wasizijidozas.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/wiwodagogoviwagi.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_off0000ab4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB4A 5152 bytes
SHA-256: 0e397c639b67d2ff8b989cf7f8711c79fd2ae4df24a62b954d520f14e40553b7
font_01_sfnt_off0000bcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBB 10084 bytes
SHA-256: 1ea51c4098446c4a1d3c89d8dad58401509a28d72bffd3798d66399a9d6adadc
font_02_sfnt_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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