Malicious PDF — malware analysis report

Static analysis result for SHA-256 62683f00214ad0ec…

MALICIOUS

PDF

59.4 KB Created: 2020-12-17 01:30:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 59390d924cfcf1f0abda57843cf66eb5 SHA-1: 414fc9e42df08b5b60d533e0b76b43a0cc7be7e0 SHA-256: 62683f00214ad0ec6c541e853a605c3e9378703bbba20026070b1f2e6f14bf00
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs suggest a phishing or spam campaign aiming to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cctraff.ru/123?utm_term=sea+fog+color In PDF document text
    • https://womukowewefe.weebly.com/uploads/1/3/4/8/134889771/kabomasarik_kilokitadom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_5f92751adb3b9.pdfIn PDF document text
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/sivemebazijipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_5f903a358089f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f8b163dac9f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446152/normal_5fce00beddb8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_5fad49c1adac9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b5eeb77-28a5-4cfb-a12e-7f9b56b1da75/nawugirufukidivolego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63ea4978-ac50-46e9-9d85-d7b19d6bc656/batebolikized.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/realidades_3_capitulo_5_examen_answers.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_off0000aedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDD 4976 bytes
SHA-256: ae75af7902e3e6813b4a07b670d6b04c39ffcabc0be2c066b89d980f05aa6dd2
font_01_sfnt_off0000bfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDE 9976 bytes
SHA-256: 62165da1f4c0bae74781b011f747e099184fb4b2c0d78d30260c73fa617ca7f2

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