Malicious PDF — malware analysis report

Static analysis result for SHA-256 373688f903c7f238…

MALICIOUS

PDF

42.3 KB Authoring application: pstoedit
MD5: bb571723775ba98e2117146f14a4fe5f SHA-1: d51ffed5b4a1231d3393b11c95377a1eb4eec158 SHA-256: 373688f903c7f2384b88f4a0327755169235c69d244a10344d7a00af1f34fc32
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to other PDF files. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs are likely used to distribute further malicious content or lead users to phishing sites.

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.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://sikijasuva.vholste.ru/uploads/2020/01/27/wulipizan.pdf
    • http://tezan.nayada-online.com/uploads/2020/01/28/2436173.pdf
    • http://45northfarm.com/uploads/1/3/0/5/130551132/pitiporozefifiw.pdf
    • http://positivitymagic.net/uploads/1/3/0/6/130621282/vofavibamus-xelarojiwusa.pdf
    • http://theatlantadoula.com/uploads/1/3/0/2/130270942/zewumapi_giniwev.pdf
    • http://aprendizajeactivobrumiel.com/uploads/1/3/0/6/130605107/6167639.pdf
    • http://monsieurpl.com/uploads/1/3/0/5/130540284/7047588.pdf
    • http://vowilufi.n26-logine.com/uploads/2020/01/27/jobenakejixagotiv.pdf
    • http://789384669264936532.org/uploads/1/3/0/2/130273766/sijufavakuf.pdf
    • http://moralish.com/uploads/1/3/0/4/130435906/b2bde1ca.pdf
    • http://b2bmaintenance.com/uploads/1/3/0/2/130270790/pefajuzige.pdf
    • http://nicelydoneauctions.com/uploads/1/3/0/6/130605302/8b942a71.pdf
    • https://lazixuted.weebly.com/uploads/1/3/0/5/130589095/3551713.pdf
    • http://nirisu.remont-msk5.icu/uploads/2020/01/27/dobagoxabi_risewebisive.pdf
    • http://flewka.ru:80/uploads/2020/01/28/726f2.pdf
    • https://vekogawiregalo.weebly.com/uploads/1/3/0/4/130483564/50b8b.pdf
    • https://lemopurewem.weebly.com/uploads/1/3/0/2/130291352/3997518.pdf
    • http://nrdiamondclub.org/uploads/1/3/0/2/130291635/wesisediwoxa.pdf
    • http://ndmbfc.com/uploads/1/3/0/6/130620297/vakawi-mitiluwiwegaleg-bejexima.pdf
    • http://ssteeleenterprises.com/uploads/1/3/0/6/130604386/2a7ba1dc8cda1.pdf
    • http://bsa-sccc-pack301.com/uploads/1/3/0/4/130476308/130476308.html#remedios+caseros+para+gota+acido+urico

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000015c6.bin
36662f30ec7f94f104ab13e969cd2b3c5e0621bf09db0ae00b7ee8f1e9f7245b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6 8840 bytes

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