Malicious PDF — malware analysis report

Static analysis result for SHA-256 1391cecf53e0f8c5…

MALICIOUS

PDF

60.3 KB Created: 2020-12-16 23:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 472e381156b4da7d8cd791fd2e62a9f3 SHA-1: 27ef4213e501c9b8128f2f01150aec9f8cf9470a SHA-256: 1391cecf53e0f8c59f7b1b2f7db6eda1d05e7716fae442faeb957c01867326ad
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or SEO spam, directing users to numerous external URLs. The presence of a critical heuristic firing for PDF_SEO_LINK_FARM and multiple embedded URLs strongly suggests a malicious intent to redirect users to potentially harmful sites. The ML classifier also flagged this PDF with high confidence, supporting the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/strik?utm_term=snapware+ornament+storage+2+tier PDF link annotation
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/tunorowazixorafenaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5f942407ebbb4.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/fajoniwuwakabezodalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5fb761ce2c639.pdfIn PDF document text
    • https://wanuwoziburake.weebly.com/uploads/1/3/4/4/134458428/3479065.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383586/normal_5fc4c50d3ea86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461485/normal_5fb8c46e23f03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f87341c5857f.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/rowubunak/45507935838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d929aecc-a287-4ca1-aefb-0787b676d60c/suredujemegonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d3812e-b280-45cd-a01f-27ec646f61c8/62438795059.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/27243310993.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/17143987985.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/19251721144.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/rodotudefamelesajelu.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_off0000ad8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8F 5436 bytes
SHA-256: 30901f78a33853dcc65924fc878c971751ba0e3df2df15ebb201c3d8985411c6
font_01_sfnt_off0000c006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC006 10364 bytes
SHA-256: 3d389218a900a2614a8a5dbbd68edf70f80df830b9ad75d4d4f02ce04ff045b9

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