Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb0ceeb1f7d4790…

MALICIOUS

PDF

71.1 KB Authoring application: Nitro PDF
MD5: f1ae57088a912748c757b2498e924fea SHA-1: dd0a80095053d328b652f27e3e66399659c3679d SHA-256: 7fb0ceeb1f7d4790913e9a3841c469399a77f09c9199361ddf68f8b9b02b0c62
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, and exhibits a critical heuristic for a large external PDF link farm. The document body contains numerous URLs pointing to other PDF files hosted on various domains, suggesting a coordinated effort to redirect users. The presence of a link farm indicates a likely SEO poisoning or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.Dropper.Agent-7906576-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7906576-0
  • 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 http://marbledeluxesouth.com/uploads/1/3/0/4/130476083/4bade1af8816c.pdf
    • http://millsacthelp.com/uploads/1/3/0/4/130483396/62b6ecd10d39.pdf
    • https://puzuxorufi.weebly.com/uploads/1/3/0/5/130544386/noxid_jomiwulaxibixog_zalijeziba.pdf
    • http://urbancampusresources.com/uploads/1/3/0/5/130541924/3680904.pdf
    • http://planaustral.com/uploads/1/3/0/4/130489128/7334819.pdf
    • http://kusisejiz.ultrasexshop.com/uploads/2020/01/29/jomovasepozudo.pdf
    • http://biztriage.com/uploads/1/3/0/3/130313427/nigozu.pdf
    • http://danielolivier.org/uploads/2020/01/28/9842367.pdf
    • http://donnezonline.com/uploads/1/3/0/5/130547450/felefuvazewib.pdf
    • http://swaymyheart.com/uploads/1/3/0/5/130544385/3699336.pdf
    • http://brenteldonmoser.com/uploads/1/3/0/6/130639790/ditodigide_wodifarujajop_vituxiki.pdf
    • http://reinasporunacausa.com/uploads/1/3/0/5/130551325/2181eeab65ea.pdf
    • http://multistreams.com/uploads/1/3/0/3/130323567/130323567.html#cambridge+checkpoint+science+workbook+9+answers+biology
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000140a.bin
b171f6075941ec03ba8234b45b1eb90281bab2ef2b95970a22f8b89b754dc301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140A 8616 bytes
font_01_sfnt_off0000d0b6.bin
e91e055cd7a2518ec53253fef87a9c959d430a0080096c535ccf6695dfdb4313		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 16216 bytes

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