Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac10248fb53a779c…

MALICIOUS

PDF

67.1 KB Created: 2020-11-14 02:09:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6cc2f3c28454a1e855252940529f45b5 SHA-1: 94f599c6636f7f5814916037383ee27eecb48e8a SHA-256: ac10248fb53a779c644b6b42e4137cf468e1ad9010308af50c18d799cb1d738d
214 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 links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure the user to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/aws?utm_term=json+dictionary+format+example In PDF document text
    • https://fikifiwokadekaw.weebly.com/uploads/1/3/4/5/134585034/1621ceb1df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382965/normal_5f9b3878844d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_5f9470aced406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426676/normal_5faf06641a14d.pdfIn PDF document text
    • https://wotafoxig.weebly.com/uploads/1/3/4/3/134306194/kotojujakugak.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/4bf31ca3-58d1-4b10-98f6-95c4c05207d6/cunningham_fisiologia_veterinaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/360cb32e-e52b-4602-9d9c-9b443ccb563c/kh2_absent_silhouette_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f67b31f-22cb-4d66-9a7c-9892e486bb5e/78824261641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98ff441b-4a02-435d-98e9-d6387ae141c2/medieval_cop_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47fb781b-1058-45ad-b716-361acd0d56ae/13121479772.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_off0000c982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 5460 bytes
SHA-256: 5f402f648c7ad28f1e9df0f6369deb34afe5de129a81800b8c8ff12541d9d4b9
font_01_sfnt_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 10412 bytes
SHA-256: 615d497073b6bf356be529c0e309d2dbd7fe25e4490ab88c4eb12c1258372edc

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