Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ede6a94beaed87…

MALICIOUS

PDF

76.3 KB Created: 2020-12-28 10:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 28a01ed3484f4be006928ec4a5531815 SHA-1: 7c7ed0c2e49c6036d31145079e6d4c0be8b66291 SHA-256: 99ede6a94beaed875351e443c11fd866edac22eac6ca87e56968557214869fc1
214 Risk Score

Malware Insights

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

The PDF contains multiple links, with one pointing to a known malicious redirector infrastructure. The document body, though obfuscated, suggests a lure for downloading software. The presence of numerous PDF links, including those to external sites, indicates an attempt to distribute or redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?utm_term=download+equalizer+fx+pro+mod+apk In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/81978dc9.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/LqjchdT/kamopi.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/zuvudagekonuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_5fd7903b42c51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_5fb4b3f58e899.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/20e15367-42da-4381-ae93-f7a6b790f5eb/ncert_solutions_class_10_science_chapter_1_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8999713-d281-4c1a-8c81-bf0d5218f302/laputeregusiveputuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b758186-9b45-41b4-9a44-3fe9c581a7ac/fexewemora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bdfac00-086a-4e35-95ef-c7e0282f858b/91028673896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c18da44b-6b2f-4064-92f3-be03c19a9ebe/analects_of_confucius_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6c5b6a-c61b-4d1b-b409-69fb8ad18e9a/york_river_state_park_fishing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd76fad-cee8-410d-ba80-ae5c15ba6ecb/onkyo_skh-410_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e89e38-25b6-438e-87bd-f91778a72d73/divexivujik.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 5408 bytes
SHA-256: f5f2691df267844ca8f3c04e595a4532ec9260571fb2324322ed90bead6c0dc0
font_01_sfnt_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 10756 bytes
SHA-256: 92b5a63769825508e2d95bd3c99d2cabc7caabf5cbd68188f9372b3c1c0a3d58
font_02_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf

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