Malicious PDF — malware analysis report

Static analysis result for SHA-256 333d37a0b71d50e7…

MALICIOUS

PDF

66.3 KB Created: 2021-02-16 10:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0cc8df5948889add1286752cd0163b0a SHA-1: a79aeae07a319446a6102ecb0c33cae3dab63c0a SHA-256: 333d37a0b71d50e7acc2f6bf404807b7d88fad985e9143f334a26bce52e0d38b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though partially corrupted, contains a URL that matches the malicious redirector, suggesting a lure to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=how+to+rekey+a+schlage+lock+youtube In PDF document text
    • https://menosakisidibus.weebly.com/uploads/1/3/5/3/135391165/375840.pdfIn PDF document text
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/dasemol.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/5522479.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403422/normal_5fc8fa5d2f5ae.pdfIn PDF document text
    • https://ziruxirunilexa.weebly.com/uploads/1/3/0/7/130775543/vegede.pdfIn PDF document text
    • https://powotatetodo.weebly.com/uploads/1/3/0/7/130738650/tubetifodeb.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/2024651.pdfIn PDF document text
    • https://xarupome.weebly.com/uploads/1/3/4/4/134469096/dezugifuwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449614/normal_6002802e27553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5ff91bf74382f.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/luboxoko.pdfIn PDF document text
    • https://fevobubutexub.weebly.com/uploads/1/3/4/4/134481878/e35bd0cf5.pdfIn PDF document text
    • https://mujonuwamuvix.weebly.com/uploads/1/3/1/3/131383921/degereviwid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jonegukum.epizy.com/tokumovixegesulutu.pdfIn PDF document text
    • http://totiwofosu.epizy.com/macmillan_english_worksheets_for_grade_5.pdfIn PDF document text
    • http://gufobipadu.epizy.com/bidotogiwize.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/lelamukesudotamametupakev.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_off0000c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 5420 bytes
SHA-256: 344c9077e369a546cedb672724d655074964cc0e54b5e7bcc22bc72e5c2dd401
font_01_sfnt_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 10116 bytes
SHA-256: 5d1970121ffc46c96b4f134b56f82d6531cabc1d028eee5f22ce015630034712

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