Malicious PDF — malware analysis report

Static analysis result for SHA-256 59360bc4562dae06…

MALICIOUS

PDF

64.8 KB Created: 2021-02-24 12:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0b1127aefba7a4acb9b493b0a19c8b8d SHA-1: 01e5488812b605cb9ea4104f192cb7601913cf6e SHA-256: 59360bc4562dae063181a611fc2bbf5a33031adb9ed45406431f9e0e8298dafe
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs point to suspicious domains, with one specifically identified as a redirector. The document body, though heavily obfuscated, contains references to 'apk' and appears to be part of a lure to drive traffic to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/strik?utm_term=the+forgotten+books+of+eden+apk In PDF document text
    • https://kikoxelila.weebly.com/uploads/1/3/4/3/134335894/02f53f2f96a18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382958/normal_5fd7d91457f32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_6029356eec441.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403674/normal_5fef44ee0d4cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449616/normal_5feebf3996529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426677/normal_602dc5e4e23ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485440/normal_6034c2cf10a4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_60140a2d21bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_601b51211f47a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_60360c0b3d3ba.pdfIn PDF document text
    • http://muvirire.22web.org/humoresque_cello_sheet_music.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/jipowumat/bakos.pdfIn PDF document text
    • http://fipegaz.epizy.com/jixofo.pdfIn PDF document text
    • http://difedomuki.epizy.com/daru_badnaam_video_song_mp4_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/91191665332.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_off0000c030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC030 5424 bytes
SHA-256: fc4f50d5ca232a06a47474ba0d6f138385d4fed11ffcc92860d652409dc0c15f
font_01_sfnt_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 10380 bytes
SHA-256: 1ee70bb831f40923984bede082949778c3618ebc7e1ae6da4fdba354fa269c0e

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