Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdc43499d316220…

MALICIOUS

PDF

70.0 KB Created: 2020-11-29 13:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 43a4257a4564e09649a208b5a218c0ad SHA-1: 7053e7c4a4ff6bd471c14fb2aaa994ef45939bf6 SHA-256: fcdc43499d316220172ecc3284ada1f90040d334463e7b58a5183b2b69b6929a
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous links designed to redirect users to external sites, employing SEO tactics to appear legitimate. Heuristics indicate these links lead to malicious redirector infrastructure, suggesting the document's purpose is to facilitate the download of further malicious payloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffine.ru/aws?utm_term=calendario+azteca+2019+pdf In PDF document text
    • https://gexeperi.weebly.com/uploads/1/3/4/3/134348656/3e46acb56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_5fbe2b8f6971c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458150/normal_5fa49a5537dd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426819/normal_5fb43b67066cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_5f912e1ae925b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_5fa76172c355e.pdfIn PDF document text
    • https://robitejipesiz.weebly.com/uploads/1/3/4/3/134375849/bubamupi-feditewovuwe-gesipozozivibe.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/9cf327da-6bec-43c9-a9d9-c31893f17628/muwikuxukorupoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a8e374-66a3-4eb1-bd93-1e693d4cb6dc/53255100087.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/73673375311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1973305-ff3a-4085-acfa-d1442e2fc37f/28176109356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b4c896-5e8f-4eed-8932-2b31321036b9/wadoxajanituxatunimik.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/planetside_2_harasser_guide.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F1 3120 bytes
SHA-256: 750d1396ea0bf5fbbfb1efa7800930e25a2e400cebbc542b316d66b1e2c172b3
font_01_sfnt_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 5408 bytes
SHA-256: bff03304a4e895f0c3b6b1fac80436232e9f278f02f8a1d4901c12e216b2f41e
font_02_sfnt_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 11256 bytes
SHA-256: 06e66090b12736d8d77cb90d24864eb5815c1b680d3865b96340e9de63b0d451

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