Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff045378074d5af…

MALICIOUS

PDF

71.9 KB Created: 2020-11-24 18:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3244bf9ecee701647c393e12910a28c6 SHA-1: eb6003df51f36028ac31088ba44b0526a4f38ff8 SHA-256: 9ff045378074d5af5bee5c41b9504abe905fedcb527dc6c22811d459a49ce74a
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 one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support the malicious nature of the file. No scripts were extracted, but the embedded links are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=wanna+read+after+we+collided+free+online+read
    • https://jovofodofipepij.weebly.com/uploads/1/3/2/6/132682866/badepek.pdf
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/44d87feaf8ee.pdf
    • https://cdn-cms.f-static.net/uploads/4505096/normal_5fb2de61997a8.pdf
    • https://vejuvofarazaxar.weebly.com/uploads/1/3/4/3/134355137/saxibisorepudo_nexefago.pdf
    • https://bawebixitowugar.weebly.com/uploads/1/3/4/3/134336924/9314785.pdf
    • https://fewaxozane.weebly.com/uploads/1/3/4/3/134341296/5090136.pdf
    • https://pasutexovemas.weebly.com/uploads/1/3/0/9/130969198/gapol.pdf
    • https://vezupololepabuk.weebly.com/uploads/1/3/4/6/134600483/e39948242cb.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5058540.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dumupa/jilopodaxuba.pdf
    • https://s3.amazonaws.com/jepavilutabilel/last_day_on_earth_hacked_pc.pdf
    • https://s3.amazonaws.com/bokofapig/irs_publication_550.pdf
    • https://s3.amazonaws.com/rerinago/lefuxorezolulikob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc25.bin
1ce0c8010ab856d9ae1aca26101d4a9f7fee3e4521e8147b380742a4a4ed14b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 4940 bytes
font_01_sfnt_off0000ed21.bin
852e8e32070061a6a445b4d1bb3e668c409b1f2da01e7d9ec85227483cbc48b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 10516 bytes