Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb3c8ad32d4882f…

MALICIOUS

PDF

78.4 KB Created: 2020-12-26 19:59:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7d58873c40fa786e1cf035240045223a SHA-1: ef6bb01208316d2dbe513ce9a88358eec47d0716 SHA-256: efb3c8ad32d4882f409ea91624a10372c283f63a52327249c7198c1db14cb0f3
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The SE_INVOICE_LURE heuristic suggests a social engineering pretext. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm the malicious nature of the file, with ClamAV identifying it as Pdf.Phishing.Trojan. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=pre+algebra+part+2+final+exam+answer+key In PDF document text
    • https://genovaxoduw.weebly.com/uploads/1/3/4/3/134388418/4510425.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/PY7ijie/90595644197.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/zafijukopa/pokemon_fireburn_beta_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/free_happy_birthday_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/38284337018.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/fifa_apk_download_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/clear_cache_android_all_apps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ffc997b-0be0-4d48-ad13-da95dc931852/ukulele_strumming_pattern.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/series_circuits_physics_classroom_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/twitter_application_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db1eba60-3168-4682-b36a-494406b585ae/25831898689.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_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 5820 bytes
SHA-256: a545fbe4136c097c21aff83bc67e7d045f41b1ca8b8d4636d0cae5e07a990970
font_01_sfnt_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 12276 bytes
SHA-256: e5c4758dce8adbd45f0cff026ee76892552520f0f985e625438b6b443fc29aee

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