Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdec35781fad31d…

MALICIOUS

PDF

63.7 KB Created: 2020-11-26 06:24:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b676f14a3125bb9278d45cd894215af8 SHA-1: cba0fa4879ad730289431f8a5e96087ef1080489 SHA-256: efdec35781fad31d21322212819ea96afa6e4282f07e87c23cbe7bd17727ec4e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a PDF redirector and a link farm. The embedded URLs point to known malicious infrastructure, indicating an attempt to direct users to harmful sites. While no scripts were explicitly extracted, the nature of the heuristics suggests the PDF is designed to exploit user interaction with embedded links.

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://cctraff.ru/123?utm_term=kindergarten+common+core+standards+pacing+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f8774ad7667c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fb9811f4b2a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454691/normal_5fa547dc8df10.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/3405140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_5f9df67387747.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/3e28d8ad-b554-4944-b1ff-6a238ac2db2d/tzumi_sound_mates_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e0bd21-481a-44e4-8378-0cc1be11a9b7/92845937892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/689a4b98-327e-48d0-a7af-e1434d09bfd4/99701040835.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/worry_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a9b221-8aa9-4efe-b448-6cd2543b2259/19417527341.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/pcnsa_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/irish_jig_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/pocomoke_high_school_md.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_off0000bd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD94 5332 bytes
SHA-256: 7556310be6ee2907b3cd94c9fcea81a1b47ff7b514bc1168371b3a9775f89707
font_01_sfnt_off0000cfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 10088 bytes
SHA-256: 403110a369bb6539f020d7412880b8b99f515561bae019003154d9075b17b09a

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