Malicious PDF — malware analysis report

Static analysis result for SHA-256 faac71d891f1337f…

MALICIOUS

PDF

66.7 KB Created: 2020-11-14 00:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 421db42e7cd22756a706d1d193386789 SHA-1: 5a72b2f4ba84023b6ec6d878203df0ca4ed92cc0 SHA-256: faac71d891f1337fb16d28c930e425dbe36d171ba4e28eceb37bbec44539084b
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 a critical heuristic firing for a malicious redirector and a link farm. ClamAV also detected the file as Pdf.Phishing.Trojan. The presence of these indicators suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://cctraff.ru/123?utm_term=a+hunger+artist+meaning In PDF document text
    • https://raxipufed.weebly.com/uploads/1/3/4/4/134474150/20a40ac0791a619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_5f9ba88d482b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_5f9f2db8b1ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_5f9b126e78f41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_5f9b36e27d7f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462982/normal_5fa475394f2f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5f9c40ba80f10.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/bezageweferagetifu.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/retisovojor/84721533610.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/90516148815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b5e8d0-f1ad-45d9-9ce3-b330dfd876ee/vovege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00c69d7-7ab2-4916-9fc3-014049bda197/carlos_nair_menem_anaconda_sin_censu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2d3adbf-eba1-4250-b09a-f17155c13d42/lebuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9a30ea-4bf2-46cb-b667-49b2942f0600/lusigutepa.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_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 5056 bytes
SHA-256: dcc3a9c14c0d52b53f3cb0847a737c037ca9888e2400561b47a8ed171b80d09c
font_01_sfnt_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 10972 bytes
SHA-256: bed16ab26aa2d3ca926197b750e59d4b17a4f234c0b6b95368d32ef382d787c6

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