Malicious PDF — malware analysis report

Static analysis result for SHA-256 0322830ad1dd3f85…

MALICIOUS

PDF

78.4 KB Created: 2021-01-01 02:47:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fc8d6b490532327c8cae7255bfac211a SHA-1: 7b4aae1c922308803344f3d8ea971c53c8a8906d SHA-256: 0322830ad1dd3f85091b070dc92fb7b71cd47e3efbc3694ca9ae7f9dee468310
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=la+amortajada+pdf+libro In PDF document text
    • https://cdn-cms.f-static.net/uploads/4479226/normal_5fc37b40a33e4.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/z1ieWwI/35426572474.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/sodim-dajozigesozix-sojesumupusimow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_5fb044e927f4d.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/SAichbC/best_launcher_for_android_tablet_2020.pdfIn PDF document text
    • https://roxilegetewus.weebly.com/uploads/1/3/4/7/134721251/123879.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/sukobogixe/74714847433.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/60432507129.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/28831112854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b18d708-1230-46f6-86c9-3de6fb94bfe2/guzelanipemevusoxopokasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad5238d6-7759-4dba-8f24-44b9f0107920/micro_mechanic_app_download_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddde06c5-e28e-477f-9a59-36217c7ea4f9/duty_driver_police_full_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0b4b8b-064e-44b6-8f47-ac1ddb265594/23384498503.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/aambala_movie_songs_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f29f74c1-ad85-47e4-9896-5ec3667a9362/jowadonusewe.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_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 5164 bytes
SHA-256: 2cf286ca200f8de13691066e10ea7cb6cd0e9d0e7fb2fc36a360613c7f2ac8e2
font_01_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 11516 bytes
SHA-256: 2204409bfd3d09b83ebc65554d49cc6e5dda6b4fc22b5230181edd0a1f01d8d5

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