Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9f364b5c4f4d53…

MALICIOUS

PDF

110.3 KB Created: 2020-11-17 07:59:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1a41285a69469bb2543cab36a42f70ae SHA-1: 9625a8a3828a9eac5fa875c2a4dd5d1ee0cf6f03 SHA-256: 9a9f364b5c4f4d53562170f2b677d0b124ae206f7ff83a8ce7182baa7b127ecc
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector. No scripts were extracted, but the presence of numerous links points to an attempt to lure the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gettraff.ru/123?utm_term=infocom+2020+acceptance+rate In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_5f9ab41260ba2.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/devuxupujikeninaferi.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/9c6d8ceea449.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/sebipuzekegarif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_5fae2400bc4ed.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/6576417.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/2360335f-8862-451e-a6cc-e98f4bd535b6/jigofogumes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95bff4f5-fbb7-49f7-8f78-03f6837b4df6/situdirazasekunote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c1478ab-8f3c-43d9-80e1-47545bd1b25e/mezirogora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5479c48a-b157-410d-ac9e-5a116ee8b336/klingon_dictionary.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_off000172cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172CB 5164 bytes
SHA-256: 5a0811e144cf973049520d6071cac8c79217df742367db01a9090ed023abb14a
font_01_sfnt_off00018449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18449 12456 bytes
SHA-256: 7c5e1bf2c57217c27f02c0af3779553b4fa0946ac7a2df6de61a4fb2331331ed

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