Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3cdafc193f1e340…

MALICIOUS

PDF

72.1 KB Created: 2020-12-16 20:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 779fabb6bf7f99586777f7745a1756e7 SHA-1: b11c76ef989390f80ee40dd5d3843c965fd1c1de SHA-256: e3cdafc193f1e340b7c4a15c86e0654e76fbe41c1daffdc96b3cc075338f379f
274 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs that redirect to malicious infrastructure, including a known redirector and a link farm. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically identifies an Amazon credential phishing lure pointing to an abused redirector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/0e8a996.pdf.
  • 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://traffmen.ru/strik?utm_term=free+vps+trial+windows In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_5fd63a301139b.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/0e8a996.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373986/normal_5fc71fcfa2db2.pdfIn PDF document text
    • https://boteroxelanivif.weebly.com/uploads/1/3/4/6/134698142/vufasare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386333/normal_5fd890bf5f34d.pdfIn PDF document text
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/puwolokuriw-pojejotobabevop-zuxixivalusewum-golegujuzos.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/50c77711e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488574/normal_5fbe0c80d1ddb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f743b1e5-44bf-42f9-ab17-2e3936ed5275/76895768051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/035d3287-cf9e-4d2a-b3d7-9ec46c2fb87a/ios_launcher_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f7a451-df5f-45b8-9cd2-a4ec9795364e/living_on_a_prayer_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/189dfc0b-9324-41ba-a768-40c827b62a0b/romitejojarobobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c85c135-91b9-4393-94ca-0192260a1c71/how_to_kill_a_lynel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31eea650-7cae-4019-a670-74c44efaf6cd/pisopanikipodikur.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_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 5060 bytes
SHA-256: 17f376cd72bc8597c95677930152da7cc52ee18d71a93f4d0470c33233e7e78c
font_01_sfnt_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 11028 bytes
SHA-256: 2599727f5de279c5e24a6c661e21be547334b442f8d1c23edefdd33744e11f41

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