Malicious PDF — malware analysis report

Static analysis result for SHA-256 27eb7205c4112ea4…

MALICIOUS

PDF

68.3 KB Created: 2020-11-17 14:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2c3ffa513bd98e3ac6940a65b3cc1421 SHA-1: 969091fb638f4c802ca064e929c5380c77bb8b39 SHA-256: 27eb7205c4112ea473a3eb24b0e1c54e41662bbec2779029e363e65cbf6f668a
214 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 external PDF files, indicating a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

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://traffking.ru/123?utm_term=hopalong+cassidy+movies+imdb In PDF document text
    • https://totobulamu.weebly.com/uploads/1/3/4/3/134310137/e4e11be3b49d1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5f910affbf1ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fifomi/captain_marvel_123movies.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/gujufosudedotojumexekar.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/propiedades_de_la_albumina_de_huevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdad665e-07d1-4f31-9c10-cb3191ff9108/37905349046.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/sopeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a340cb-012f-4c05-b864-0ac46c024d00/80143267748.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/2020_research_denver.pdfIn PDF document text
    • https://s3.amazonaws.com/mewezekilafef/earth_science_unit_3_study_guide_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5996b80-1253-41df-b85b-447d9befa87d/is_google_email_encrypted.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC219 5268 bytes
SHA-256: efc8a1c45f7c5706fe0d413893e618b29e1adb0722f8b25f6805fc6d98bdb0ff
font_01_sfnt_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 10064 bytes
SHA-256: c6fbc429cc35140b8f2812f892e6bfc5394c1ffbef2c44e0ee7a4cda9972cfc9
font_02_sfnt_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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