Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4b57ecc3d6a287…

MALICIOUS

PDF

59.7 KB Created: 2020-12-22 05:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 23bdd4b8ea9b7fb7f487e5510279d34a SHA-1: 2f370fb636e1d87ba3537c932e1547968f9d6d20 SHA-256: de4b57ecc3d6a287a3ca58c1ce1e06f628c7b121173b83a35bd1b1b2310fb801
274 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious due to its critical heuristic firings indicating it's a redirector and a brand-impersonation credential phishing lure, specifically impersonating Facebook. It contains a mass of external PDF links, many of which point to redirector infrastructure. The embedded URLs likely lead to a second-stage phishing page designed to steal user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/749259.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://gettraff.ru/wb?keyword=laser%20quest%20spokane In PDF document text
    • https://static.s123-cdn-static.com/uploads/4467571/normal_5fdda54b61493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394073/normal_5fbbade9b3831.pdfIn PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/749259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5f99c1d5c60bf.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/seginabufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416316/normal_5fbf11efce7e3.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/lixavabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f8a24b8db886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5fd6581115c8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_5f9816f745b83.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/jeponowon/ky_drivers_license_manual_2019.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_off0000afbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBE 4912 bytes
SHA-256: 46693bf1905c7f3ab543f1f85b5cd215f68e1e85c9bb9c26a98f6efc0c6b34dd
font_01_sfnt_off0000c08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08F 10020 bytes
SHA-256: e94f3026295c957cc57b6b798c33b01d35d73188cb9b516d57f589a65a2b4840

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