Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23b931599bd83de…

MALICIOUS

PDF

86.1 KB Created: 2020-11-29 09:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e8311feae73fadc44fcc52130a3ad75a SHA-1: ef4cf8316de50f2ad29c4400d2b15db2ef66027b SHA-256: c23b931599bd83de7ac52c3021edcc96266b7b87f28fbde8cb1e4228f5e0f6d9
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector pointing to 'https://traffine.ru/aws?utm_term=a+m+b+u+full+form'. The presence of a large number of external PDF links, many hosted on cloud storage, suggests a link farm designed to obscure the ultimate destination or to distribute malicious content. ClamAV also detected this file as Pdf.Phishing.Trojan.

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://traffine.ru/aws?utm_term=a+m+b+u+full+form In PDF document text
    • https://paxiguvemogi.weebly.com/uploads/1/3/4/3/134317910/wapotusedudopa_nakilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_5fb370f40522e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_5fad34f5af2e6.pdfIn PDF document text
    • https://karezolakep.weebly.com/uploads/1/3/1/3/131398125/satuvazitigadanoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_5f8fae2bbb5d8.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/mewezekilafef/12342201110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ce890a-f6a7-4fa4-949a-9b80edc3f734/17787388295.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/zenagakerabozirixoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c09070-c183-4fd8-ac11-2711582aade3/42765130220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17fdcf81-4643-452d-b43f-c15c13bfde75/54322760945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1d3136-b6ad-4690-a4b9-93742c93d162/nyc_doe_stars_classroom_legacy.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/71570385382.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/limowudabodutelogogupeg.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/91244911703.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_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 4652 bytes
SHA-256: cac2733ca978f07384b130f423a984fe9d75a72bb5c406ac03ffe093a90cad58
font_01_sfnt_off00012670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12670 10928 bytes
SHA-256: adb3c32dda4cd9b96cdcb32d1a343de142a4506b877b17d84c4450706d13891c

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