Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a47af000ae9797…

MALICIOUS

PDF

37.5 KB Authoring application: Smallpdf Desktop
MD5: 16a3f10315cc2c1fd43e847150cff9a1 SHA-1: c3f086deff2a3a82d97ce1673f99f20699d4a7d5 SHA-256: 71a47af000ae9797e8f4646ccbc4f5604cae1d046d58dd799dac196e6bc909d6
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that contains a large number of external links, many of which point to other PDF files hosted on similar domains. This indicates a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

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://triptexts.com/uploads/1/3/0/7/130775245/jefasixumir_rajulilusuni_sozoxar_mezeva.pdf
    • http://nfondy.com/uploads/1/3/0/6/130639733/76e9a813.pdf
    • http://trueelegancetransportation.com/uploads/1/3/0/5/130538986/5916304.pdf
    • http://littlethatch.net/uploads/1/3/0/3/130323789/neweto.pdf
    • http://www.folsombentleysquare.com/uploads/1/3/0/6/130603905/3772760.pdf
    • http://mycommonwealth.org/uploads/1/3/0/6/130605472/3683807916.pdf
    • http://www.thekatieknapp.com/uploads/1/3/0/5/130589427/1638821.pdf
    • http://mylistingexpired.net/uploads/1/3/0/3/130313284/gekezazifaravis.pdf
    • http://barriebasketball.com/uploads/1/3/0/5/130543141/wuxetowi.pdf
    • http://stop-n-smelltheflowers.com/uploads/1/3/0/5/130588651/finebifej.pdf
    • http://playbash.com/uploads/1/3/0/7/130776716/f234731d2ee5c.pdf
    • http://ptamarymunfordelementaryschool.com/uploads/1/3/0/4/130483886/folanibiputa.pdf
    • http://sandstory.org/uploads/1/3/0/4/130483606/rivururijuxe.pdf
    • http://dinejuneau.com/uploads/1/3/0/7/130739993/desamosu.pdf
    • http://forthepeoplefestival.com/uploads/1/3/0/2/130289166/2788e2432ce8b.pdf
    • http://trueindigothemovie.com/uploads/1/3/0/2/130291809/rusag-gemajilekirebi-dubinisikuju.pdf
    • http://pinballwizard.org/uploads/1/3/0/6/130639052/xisag.pdf
    • http://ashlandfenceco.com/uploads/1/3/0/5/130588784/5587d7.pdf
    • http://convictkreations.com/uploads/1/3/0/7/130776585/9441772.pdf
    • http://cleanallpm.ca/uploads/1/3/0/2/130273589/walowometiredon-xejabe-didesowoboxoz.pdf
    • http://bellinghamweekly.org/uploads/1/3/0/6/130603916/nuvuzuzas.pdf
    • http://brushscription.com/uploads/1/3/0/8/130874133/b2988da44adf88.pdf
    • http://menteriaithcasnewydd.org/uploads/1/3/0/8/130813851/luvemumereluge-kogasegemunax-fofuger.pdf
    • http://rochecenter.org/uploads/1/3/0/7/130740164/130740164.html#example+of+recommendation+letter+for+teaching+position

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000315a.bin
eb347b63ae024af132e74804bccca68be26a09cc58bad1132462f5570f3726e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x315A 7328 bytes

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