Malicious PDF — malware analysis report

Static analysis result for SHA-256 611b3fc87502f62b…

MALICIOUS

PDF

67.5 KB Created: 2021-02-13 02:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: abab273d1c9bffd9af8ee397909b15df SHA-1: 6c2905c71f40438bfb1deee7cda80c1bce5864e9 SHA-256: 611b3fc87502f62b9fca6d3c5da97b48f7925bc26f9b75a91b26c48e581eda05
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to external, untrusted content.

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://crophysi.ru/123?utm_term=120+x+120+bedspread In PDF document text
    • https://kamojadatuxam.weebly.com/uploads/1/3/5/3/135316538/zinufizidimeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492529/normal_5fcd65c17239e.pdfIn PDF document text
    • http://nanewak.iblogger.org/ballast_water_record_book_template.pdfIn PDF document text
    • http://airet.space/makexuvanipere2h5.pdfIn PDF document text
    • http://unonatur.space/tajevivalujitazovawils3pof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_60220bbfa44a9.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/goviwigax/sazizem.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/xekejekadulazolixixerawed.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/video_converter_online_mp4.pdfIn PDF document text
    • http://ferurexage.epizy.com/you_are_beautiful_beyond_description_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/14228855216.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/wewixepixupawetitoveserar.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_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 5360 bytes
SHA-256: ea37ab79a33f64c36c98f921e70c9f105a3f8333f07c7a7f66d7e4e608437be9
font_01_sfnt_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 10864 bytes
SHA-256: 151f70045ac41d13b65201e76ace84a782f92d82f5234f9dcf9f301bd3c7e1b7

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