Malicious PDF — malware analysis report

Static analysis result for SHA-256 9188dbf4b92fdc14…

MALICIOUS

PDF

68.0 KB Created: 2020-12-29 21:21:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a3dae6a6783153c34735b805b6c79055 SHA-1: 4e5749897ec1a2202d0124d5cf71290574984016 SHA-256: 9188dbf4b92fdc14a29126a97696a7c6ed1ffb2c02e8dc0f25057500377462cb
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate the PDF is designed as a link farm, likely to drive traffic to malicious sites. While no scripts were extracted, the presence of embedded URLs and the ML classifier's high confidence suggest a phishing or redirection 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://traffmen.ru/wb?keyword=mastercraft%20interior%20door%20reviews%202019 In PDF document text
    • https://zetewewab.weebly.com/uploads/1/3/4/4/134479884/sanizekafoza_pajudedolivodo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426260/normal_5fc85e5cc9a61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472185/normal_5fd89d92c1833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f870a89554b2.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/vazisi/example_of_instrumental_variable.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/5000917986.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/four_color_personality_test.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/xejagepamiwojirutikozutug.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/arranging_adjectives_in_a_sentence_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/felawu.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/11834744229.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/wofanefobixijajamedofa.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_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 5624 bytes
SHA-256: 2e4f21ff48128283138ad19831c93a5e201bada92b0d7fc7516f571e56467c15
font_01_sfnt_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 10168 bytes
SHA-256: e3a2f53cfc92212221413b0c4f4150ecbc94de15317d405293baa2febc08a18b

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