Malicious PDF — malware analysis report

Static analysis result for SHA-256 9950be78f7d2ceb1…

MALICIOUS

PDF

78.4 KB Created: 2021-01-11 21:20:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 17c4f8d7a28eece05028d41b94163982 SHA-1: 27985098a6d3a9bfa1b0a8e04368814297e48a67 SHA-256: 9950be78f7d2ceb19c0697b331fb3bbd8a271e6d28f6fd001707cd39dc36658b
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate a malicious redirector and a link farm, suggesting the primary purpose is to direct users to harmful sites. While no scripts were explicitly extracted, the PDF structure itself is being leveraged to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=skyrim+flawless+diamond In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419205/normal_5f96927beeda3.pdfIn PDF document text
    • https://sugogovofel.weebly.com/uploads/1/3/1/0/131069978/vajaforur.pdfIn PDF document text
    • https://site-1172684.mozfiles.com/files/1172684/fitness_preparation_for_inca_trail.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408718/normal_5fb3e8063dca7.pdfIn PDF document text
    • https://baripunasese.weebly.com/uploads/1/3/4/1/134131446/xoriwolitoluzetiguxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f9ce7897e56b.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/ZIgduBi/51562711501.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/nitatotol/96400239058.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/98600668491.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/gezen.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/21078663937.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 5416 bytes
SHA-256: 19465cb94ee8a34fd414e00ed53cef00a1487889cd00f1d06ea3713ccd28396d
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 5824 bytes
SHA-256: b4f63f866e196b2c659b200ca75e1e98c4b51fb382fc82ef905ecdf8218af672
font_02_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 11000 bytes
SHA-256: a0362a8953e1fea2b372b50ce7fd44a6b03f4ecb531a40aa66ce62a4cb1e7431

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