Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8575d1ae3ed64b8…

MALICIOUS

PDF

66.7 KB Created: 2020-11-14 02:21:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c8afdd5f1cc0ce3c1fb0918ccb95ca51 SHA-1: 71a508518c4b27bd0dc6d23ab601944a9825dc80 SHA-256: a8575d1ae3ed64b8b5b3b451d5c73a632c90dd882e76a321bc3c3060e8edfebe
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics, including a malicious redirector link and a PDF link farm, indicating a likely phishing or SEO manipulation campaign. The presence of embedded URLs and the ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to potentially harmful content.

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://traffking.ru/aws?utm_term=excel+vba+worksheetfunction+match+multiple+criteria In PDF document text
    • https://rimidewazasi.weebly.com/uploads/1/3/4/3/134317879/8688672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_5f93ffb2cbc1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_5fa6b754e1b8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f8f091747866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411501/normal_5f9572412c2a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f991bc020b2e.pdfIn PDF document text
    • https://rabidibizuzej.weebly.com/uploads/1/3/4/6/134648686/firipetinul_jejolidukegore_jiginavuwowozog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_5fa4acaf5c3e4.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/de6757a9.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/penale/touching_spirit_bear_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/satyanarayana_biochemistry_free_download.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_off0000c3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E9 5636 bytes
SHA-256: e32163a356d37ca8f7e64d198fe5f59efb7a90ed3e1ff4ca9f18614c76237fd3
font_01_sfnt_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 11260 bytes
SHA-256: 44310775f3611774a8e5722d04fdc7cdd93bbdde3b2baad97ec91efa0f800031

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