Malicious PDF — malware analysis report

Static analysis result for SHA-256 157c311dc035c269…

MALICIOUS

PDF

49.1 KB Authoring application: LibreOffice
MD5: 0d71053f08c8d38467309272c676454f SHA-1: ff1db179475abde370b68f2c5e308392bba9eaea SHA-256: 157c311dc035c26945e4fcba18852cb486a366fa2e2c5df8aeac9bd3fee0f5df
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDF files hosted on various domains, a technique often used for SEO link farms or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted from this sample, but the extensive URL linking is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sgvweekly.com/uploads/1/3/0/4/130490019/zokilomufaliw.pdf
    • http://mentoringfutureleaders.com/uploads/1/3/0/6/130603891/6029633.pdf
    • http://velobristol.com/uploads/1/3/0/4/130483200/dutawaju.pdf
    • http://bspi.pt/uploads/1/3/0/7/130775358/timikufokaradu_situdidemegam.pdf
    • http://7daysdietplan.net/uploads/1/3/0/4/130491852/7575942.pdf
    • http://moemoneybeats.com/uploads/1/3/0/6/130605506/sukokarozuxezuw.pdf
    • http://amylouiseheil.com/uploads/1/3/0/4/130479171/gaketapegavomigoj.pdf
    • http://fredericksequestrianinternationalstabling.com/uploads/1/3/0/7/130775458/5888592.pdf
    • http://ravenheim.net/uploads/1/3/0/5/130589312/414582.pdf
    • http://www.tannerhewittvisuals.com/uploads/1/3/0/6/130639356/6824323597c2.pdf
    • http://myacexportfolio.com/uploads/1/3/0/7/130775880/nefajuledokaki-rutiwiwaxal-tevazo.pdf
    • http://colormeribbons.com/uploads/1/3/0/4/130478347/jeneto-wefamogogemal-lamafoja-dikonatel.pdf
    • http://inkgenio.it/uploads/1/3/0/6/130621926/zidokipejevezaj.pdf
    • http://patriciabondrn.com/uploads/1/3/0/6/130620437/maxipekobenupa.pdf
    • http://united56.pleasingfood.com/uploads/1/3/0/5/130589435/130589435.html#adobe+xd+cc+2018+for+mac

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065a9.bin
e6e10a707ac3f31d72f37cbecb84e371fa0cd0455570424208080668356cdb15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A9 8484 bytes

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