Malicious PDF — malware analysis report

Static analysis result for SHA-256 51820426b51f2c6d…

MALICIOUS

PDF

72.3 KB Created: 2020-11-14 00:19:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 795aa87b26c3d7e1be6753ed42c8a348 SHA-1: 98703841b0eaab51c42db2a0894ed35da815c7f7 SHA-256: 51820426b51f2c6da167cda2dee6feb0e06238364e91ac7a286b37efa1d05e4a
162 Risk Score

Malware Insights

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

The PDF file contains embedded links and is flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to an installer. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ggtraff.ru/aws?utm_term=canoscan+lide+200+installer In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_5fa99b0e4ec97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421214/normal_5f9be0dd00613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5fa912f010615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461485/normal_5fa948aaa24ef.pdfIn PDF document text
    • http://www.opentle.orgIn 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/b37b6971-eeca-4561-9a14-28a6a10e8aef/26091955705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fe92fc0-c67e-47f1-b5b5-113cc311eb45/lg_x_power_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a02644d7-285d-49e3-a72e-c694f7849b97/49555717350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fada3f1c-1429-492d-98a9-a5147a0af76f/80825085148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3025a148-db17-44ae-a592-22daf3f311cc/jisenewuzuxik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ef000b-3f7a-4d6f-965a-587033483481/bakalalutisidatur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892613ef-c3a2-4dc5-a89e-234725ac4a5f/lizidesoparerumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3e8156-17fb-4d7d-aac1-ea979dca271b/75771442152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/283c85c3-df05-4bbe-9e78-5fdd54a1abbb/kapivasoniruw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5df23d-4ec0-4da4-b9e4-8f83d26c0a15/28366869589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a95bca6-ec80-4579-b8a7-5e13b7ef1302/26345994363.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ca0b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCA0B 13520 bytes
SHA-256: 0507f8fc953d4469f1ee02a6b39bc18fadaf4db615c54a60164a9a6b1e81504d
font_00_sfnt_off0000b8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B1 5112 bytes
SHA-256: 7bebcbe15d9c806ab92ac5b7869dd1ee0e00a536938c7c93ef05faafae5b7332
font_02_sfnt_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 10204 bytes
SHA-256: 79f8510318c74a3c7d65cbd5d07626565c1bf41df7edf6e6410e755aa83e13de

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